A&A 393, 887-896 (2002)
DOI: 10.1051/0004-6361:20020916

On Be star candidates and possible blue pre-main sequence objects in the Small Magellanic Cloud[*]

R. E. Mennickent1 - G. Pietrzynski 1,2 - W. Gieren1 - O. Szewczyk2


1 - Universidad de Concepción, Departamento de Física, Casilla 160-C, Concepción, Chile
2 - Warsaw University Observatory, Al. Ujazdowskie 4,00-478, Warsaw, Poland

Received 24 April 2002 / Accepted 17 June 2002

Abstract
Recently the OGLE experiment has provided accurate light curves and colours for about 2 millions stars in the Small Magellanic Cloud. We have examined this database for its content of Be stars, applying some selection criteria, and we have found a sample of $\sim$1000 candidates. Some of these stars show beautiful light curves with amazing variations never observed in any Galactic variable. We find outbursts in 13% of the sample (type-1 stars), high and low states in 15%, periodic variations in 7%, and the usual variations seen in Galactic Be stars in 65% of the cases. The Galactic counterparts of type-1 objects could be the outbursting Be stars found by Hubert & Floquet (1998) after the analysis of Hipparcos photometry. We discuss the possibility that type-1 stars could correspond to Be stars with accreting white dwarf companions or alternatively, blue pre-main sequence stars surrounded by thermally unstable accretion disks. We provide coordinates and basic photometric information for these stars and some examples of light curves.

Key words: stars: pre-main sequence - stars: emission-line, Be - stars: variable: general - X-rays: binaries - galaxies: individual: SMC

Note to the reader concerning this PDF file: legends and scales of the figures were added on July 5, 2013.


1 Introduction

About 1/6-1/3 of all Galactic B-type stars with luminosity class III-V once showed H$\alpha$ in emission and have therefore been classified as Be stars (e.g. Zorec & Briot 1997). The optical and near-infrared spectra of Galactic Be stars usually display hydrogen, He I and singly ionized metallic emission lines, whose double-peaked shape indicate their origin in a circumstellar gaseous quasi-Keplerian disk. Detailed studies of Be stars in the Small Magellanic Cloud (SMC) have been performed only in recent years, being especially confined to open clusters like NGC 330 (e.g. Keller et al. 1999). These studies show the importance of studying Be stars in the low metallicity environment of the SMC since they serve as probes to test for the mechanisms of disk formation and of global disk oscillations (Baade et al. 2002; Hummel et al. 2001).

Over the past years, the microlensing projects (OGLE, MACHO, EROS) have monitored millions of stars in the Magellanic Clouds and Galactic bulge for variability. The huge resulting photometric databases are very well suited not only for microlensing studies but also for many other issues of modern astrophysics, including the distance scale, variable stars, star clusters etc. In particular, the OGLE II project (Udalski et al. 1997), has provided accurate BVI measurements for about 6.5 million stars from the central parts of the Magellanic Clouds (Udalski et al. 1998, 2000). Based on this same material, a unique catalog containing about 68 000 variable stars has just been released (Zebrun et al. 2001b).

The aim of this paper is to search the OGLE II database for Be star candidates and provide a much larger sample of these stars in the SMC than previously known. This will provide the basis for posterior follow-up spectroscopic studies of these objects, necessary to fully understand their nature. We will also call attention to several apparently new classes of light curves which appeared during our search for Be stars in the SMC.

The paper has the following structure. Observational data and the applied selection criteria are described in Sect. 2. Results are presented in Sect. 3, and discussed in Sect. 4. In Sect. 5, we present our current conclusions on the underlying nature of the observed types of variability.

2 The data

During four years (1997-2000), about 4.5 and 2 million stars were monitored in the LMC and SMC, respectively, in the course of the OGLE II project (Udalski et al. 1997). Typically, about 400 I and 30 B and V observations were secured for each star. An application of a newly developed photometric pipeline (Wozniak 2000; Zebrun et al. 2001a) to the data, based on the DIA method introduced by Alard & Lupton (1998), resulted in the detection of about 68 000 variable stars (Zebrun et al. 2001b). This catalog, apart from presenting positions and light curves for all its objects, provides in addition cross identifications with objects detected during earlier reductions carried out with Dophot. It should be stressed that the positions of the variable stars obtained with the DIA package were obtained from the variable signal only, and may be in principle quite different, especially in the very crowded regions, from the positions obtained from the Dophot photometry. However, the great majority of variable sources detected with DIA were unambiguously cross-correlated with objects detected with Dophot (Zebrun et al. 2001a).

To carry out our search, we inspected the OGLE II SMC BVI maps, and looked for stars matching the usual luminosities and colours observed in Galactic Be stars. Absolute magnitudes of Be stars based on Hipparcos parallaxes (Wegner 2000) indicate that Be stars of luminosity classes IV-V and III have absolute V-band magnitudes between -4 and 0. However, Garmany & Humphreys (1985) report on a population of extremely luminous non-supergiant Be stars in the Magellanic Clouds with absolute V-band magnitudes up to -6. Therefore, we searched for stars having absolute V-band magnitudes between -6 and 0. Assuming a distance modulus for the SMC of  $19.0 \pm 0.2$ mag, a visual extinction of 0.3 mag and a typical amplitude of the photometric variations of Be stars of 0.2 mag, the above absolute magnitudes imply apparent V-band magnitudes between 13.1 and 19.7. In addition to this magnitude constraint, we required that the selected stars should have colours in the range in which Galactic Be stars are usually found, viz.  -0.4 < B-V < 0.6 and -0.35 <V-I < 0.8. Using these criteria, we obtained a first sample of 5168 Be star candidates in our database. As a next step, we extracted the I-band light curves for each of these objects from the OGLE II catalog of variable stars (Zebrun et al. 2001b). The light curves were visually inspected and spurious variables, Cepheids and eclipsing binaries rejected. We then proceeded in classifying the remaining 1056 stars according to the appearance of their light curves. Our set of Be star candidates is likely to be complete for stars showing a rms larger than 0.02 mag in the I band. However, we could have missed Be stars either not showing long-term variations, or with I-band amplitudes less than 0.02 mag.

3 Results

Surprisingly, we found not only a large sample of 685 objects showing light curves similar to those observed for Galactic Be stars (we call them type-4 stars, with stochastic or sometimes quasi-periodic variations), but also 139 objects showing outbursts (called type-1 stars), 154 showing high and low states (called type-2 stars), and 78 stars showing periodic or near-periodic long-term oscillations (type-3 stars). 18 type-1 stars also showed sudden luminosity jumps like those observed in type-2 stars. We called them type-1/type-2 stars. In Figs. 1-6, we show examples of light curves for objects of the type-1 to type-4 subclasses. Basic information (OGLE name, distance (in arcsec) to the nearest star detected with Dophot, V magnitude, B-V and V-I colours, scatter of I-band magnitudes, and optional comments) on these stars is given in Tables 1-6. It is striking that type-2 and type-3 light curves have not been observed in any Galactic variable, to the best of our knowledge, and very few cases of Galactic type-1 stars seems to have been detected (see Sect. 3.1). Therefore all these stars clearly deserve further study. In Figs. 7 and 8 we show the V versus B-V, and V-Iversus B-V diagrams for the entire sample of stars. It is observed that the number of Be star candidates declines towards the extremes in both diagrams, indicating that the ranges of magnitude and colour we chose for our search were probably near-optimum to include all the Be stars in the database. Regarding the main sequence, most stars are displaced to the red in the V versus B-V diagram; this is in principle consistent with hydrogen recombination (free-bound and free-free) emission from circumstellar envelopes around Be stars (Dachs et al. 1988). Keeping in mind that our data have not been corrected for interstellar or circumstellar reddening, the sharp blue cut-off in the B-V colour is notable. This observational fact is consistent with the vanishing of the Be phenomenon in spectral types earlier than B0, partly due to the efficiency of radiation pressure to remove circumstellar gas in hotter stars.

3.1 Type-1 stars


 

 
Table 1: Type-1 stars. $\Delta \Phi $ is the distance (in arcsec) to the nearest star detected with Dophot.

Star
$\Delta \Phi $ V B-V V-I rms

003623.36-733922.3
0.601 16.158 -0.233 -0.212 0.012
003832.64-732234.9 0.076 15.264 -0.139 -0.117 0.01
003918.20-733656.6 0.245 14.548 0.484 0.714 0.017
003922.09-732531.6 0.031 16.931 -0.041 -0.146 0.019
004036.15-732921.6 0.04 16.548 0.13 -0.03 0.062
004207.86-734501.9 0.136 16.804 -0.055 0.049 0.02
004215.08-731710.4 0.097 15.966 -0.157 -0.055 0.019
004231.84-732200.9 0.024 15.376 -0.106 -0.019 0.077
004326.72-725910.3 0.439 16.858 -0.128 -0.127 0.018
004502.43-732318.6 0.137 16.777 -0.048 0.039 0.012
004624.69-724657.3 0.609 19.333 0.203 0.463 0.045
004624.74-731941.7 0.102 15.851 0.069 0.169 0.09
004631.41-730335.6 0.085 17.113 -0.118 -0.002 0.04
004646.81-731849.2 0.054 16.701 -0.013 0.207 0.015
004650.39-731017.7 0.092 15.513 -0.105 -0.022 0.014
004653.17-732330.2 0.327 15.252 -0.033 0.012 0.014
004717.43-725227.6 0.119 17.071 0.353 0.403 0.136
004757.42-731050.8 0.122 15.714 -0.036 0.041 0.02
004800.14-730728.6 0.055 16.354 -0.226 0.046 0.101
004803.08-725404.2 0.347 16.704 -0.127 -0.126 0.015



 

 
Table 2: Type-1 stars showing transient quasi-periodic outbursts. ART means "after removing trend", BHS "before high state" and BF "before fading".

Star
$\Delta \Phi $ V B-V V-I rms Time-scale (days)

004957.09-730204.5
1.776 17.129 -0.133 0.122 0.049 332, ART
005039.05-725751.4 0.028 17.211 0.15 0.301 0.078 136
005118.72-732846.3 0.158 15.765 0.039 0.248 0.013 216, ART
005149.34-724134.3 0.069 16.026 -0.013 0.163 0.02 38, BF
005157.18-730811.8 0.183 16.544 -0.058 0.092 0.025 22, ART
005235.60-723751.7 0.03 14.573 -0.145 -0.114 0.045 94
005312.58-725533.6 0.039 16.024 -0.121 -0.029 0.037 58
005321.08-724548.3 0.095 15.526 -0.201 -0.067 0.049 231
005355.66-724359.2 0.151 15.56 -0.092 -0.057 0.114 85 or 42, ART, BHS
005623.53-723926.3 0.071 16.225 0.065 0.309 0.022 215, ART
005758.52-722228.7 0.084 15.794 -0.088 0.002 0.03 40, ART, BF
005802.33-724137.5 0.031 17.092 -0.167 -0.154 0.057 16, ART
005950.21-722817.4 0.123 17.342 -0.112 0.03 0.017 173, ART
010001.47-724046.9 0.062 15.876 -0.187 -0.039 0.154 133 or 101, ART
010023.52-723302.7 0.025 15.6 -0.194 -0.079 0.022 168, ART
010120.64-721118.7 0.097 15.489 -0.065 0.078 0.019 75, ART
010332.59-720326.5 0.086 14.91 -0.207 -0.129 0.146 127, ART
010409.79-723835.6 0.086 15.325 -0.097 0.046 0.026 112, BHS
010838.56-723633.5 0.036 16.115 -0.075 0.092 0.035 136



  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f1.eps}
\end{figure} Figure 1: Examples of type-1 Be star candidates showing sharp outbursts.
Open with DEXTER


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f2.eps}
\end{figure} Figure 2: Examples of type-1 Be star candidates showing hump-like outbursts.
Open with DEXTER

The outbursts shown by type-1 stars were basically of two types: those characterized by a sudden rise of luminosity followed by a gradual decline, generally lasting tens of days with amplitudes $\mathrel{\copy\laxbox}$0.2 mag, and those with usually slower declines, lasting hundreds of days with amplitudes >0.2 mag, and characterized by more symmetric rising and fading timescales. In general, in both kinds of outbursts, the stars were redder when brighter and we could not find any evidence of a correlation of outburst rising delay with wavelength. Some stars showed both kinds of outbursts, and sometimes it was difficult to classify them when the outburst was faint and not well resolved, or in the cases of noisy light curves. For this reason we do not provide a sub-classification for type-1 stars. Not always these stars are showing a constant quiescence brightness level. For 16% of type-1 stars (22 objects) it was possible to identify an outburst time-scale, i.e.  a typical time for outburst recurrence, although this recursion sometimes was observed only as a transient phenomenon and not during the whole observing period. Basic information for type-1 stars is given in Tables 1 and 2. Exemplary light curves of this type of variable stars are shown in Figs. 1 and 2. The outburst time-scales, given in Table 2, run from 16 to 332 days, with a mean of 126 days. The time-scale histogram shows a decrease of cases toward longer periods; 68% of the objects show time-scales shorter than 150 days. There is no clear correlation between outburst time-scale, and stellar colour or apparent magnitude.

Our type-1 objects probably correspond to the bumpers found in the Large Magellanic Cloud by Cook et al. (1995) after analysing the MACHO collaboration database. These authors report on the discovery of a group of bright main sequence stars with $V \sim 15{-}17$ which have a constant luminosity for extended periods of time, but show occasional outbursts at 10-30% amplitude level. They found that the episodes in more than 50% of the cases are asymmetric and shorter than about 50 days with a more rapid brightening than dimming. The fact that H$\alpha$ and H$\beta$ emission was observed in the spectra of 7 of these stars led Cook et al. (1995) to suggest that these stars could be related to, or maybe identical to, Galactic Be stars.

The Galactic counterparts of type-1 objects could be the outbursting Be stars found by Hubert & Floquet (1998) analyzing Hipparcos photometry. They find short-lived outbursts in $\omega$ CMa and other 13 Be stars, and also a long-lived outburst in $\upsilon$ Cyg and another 7 Be stars. The outbursts were preferentially detected in early Be stars with rather low to moderate projected rotational velocities. The average time scale for the recurrence of short-lived outburst is, however, slightly larger than that observed for our SMC sample. Hubert & Floquet (1998) argue that both kinds of outbursts probably have the same origin and can be explained by discrete high density emitting plasma events seen under low inclination angles with respect to the rotational axis. The number of cases presented by these authors is too small and the photometry too scarce to make a detailed comparison with our type-1 stars, however.

Although at present we cannot exclude the Be star nature of type-1 objects, we will present, in the next section, two possible alternative explanations for these objects.

3.2 Type-2 stars and type-1/type-2 stars

Type-2 stars show sudden brightness jumps of an amplitude of a few tenths of magnitude, with the star remaining at a rather constant brightness level for hundreds of days. Type-2 stars usually don't show additional variability, like the irregular variations observed in type-4 stars, except for rather smooth long-term changes. Type-2 stars can be found in basically the same colour range as type-1 stars, but type-2 stars are statistically bluer than type-1 stars. Eighteen type-1 stars in our database also showed high-low states like those observed in type-2 stars. These type-1/type-2 stars were only found in the range of 15.5<V<17 and in a narrow colour box characterized by  -0.2<B-V<0.2 and -0.2<V-I<0.25. The existence of these "transition" stars supports the conjecture that type-1 and type-2 stars could correspond to the same kind of object. Basic information for type-2 and type-1/type-2 stars is given in Tables 3 and 4.

 

 
Table 3: Type-2 stars.

Star
$\Delta \Phi $ V B-V V-I rms

004234.39-733058.2
0.043 15.989 -0.148 0.002 0.021
004258.05-730230.7 0.036 16.059 0.028 0.176 0.019
004319.46-731705.7 0.099 16.403 -0.056 0.132 0.032
004330.69-732034.2 0.028 16.428 -0.194 -0.177 0.009
004414.25-731215.5 0.086 17.297 -0.107 -0.028 0.023
004443.05-731316.5 0.068 16.217 -0.072 0.028 0.017
004504.35-724449.9 0.076 17.906 0.336 0.549 0.051
004510.40-731648.1 0.104 15.855 -0.105 -0.022 0.009
004539.31-731040.1 0.433 17.849 -0.104 0.702 0.088
004546.74-733233.1 0.008 16.284 -0.032 0.158 0.032
004556.84-730919.8 0.068 17.128 -0.057 0.031 0.013
004601.22-731821.9 0.11 16.374 0.033 0.255 0.018
004610.97-732535.2 0.037 15.439 0.009 0.032 0.146
004633.48-730352.1 0.026 15.489 -0.066 0.063 0.04
004639.77-725241.0 0.047 15.614 -0.179 -0.173 0.011
004651.07-730215.3 0.048 15.801 -0.026 0.176 0.026
004655.32-731207.6 0.094 16.164 -0.113 0.103 0.03
004714.29-731044.0 0.09 17.635 -0.022 0.043 0.022
004714.53-731349.7 0.131 15.068 -0.196 -0.172 0.009
004719.31-732533.6 0.11 16.449 -0.074 0.145 0.073



 

 
Table 4: Type-1/type-2 stars. The nomenclature is as in Table 2.

Star
$\Delta \Phi $ V B-V V-I rms Time-scale (days)

004402.00-733129.4
0.221 15.456 -0.003 0.232 0.016 284
004406.65-732938.2 0.034 16.285 -0.029 0.114 0.02  
004650.21-732807.3 0.042 15.442 -0.192 -0.191 0.017  
004738.11-731126.1 0.12 15.484 -0.114 0.022 0.008  
004800.73-732253.0 0.137 15.842 -0.048 0.144 0.018  
004817.58-725028.8 0.133 16.329 -0.109 -0.048 0.016  
004848.27-732611.3 0.062 15.462 -0.098 0.016 0.067 39, BF
004858.25-724119.4 0.054 16.157 -0.074 0.076 0.015  
005045.50-730112.9 0.071 16.398 -0.057 0.038 0.019  
005053.20-731030.8 0.046 15.925 -0.054 0.157 0.096  
005105.65-731311.5 0.044 15.911 -0.032 0.208 0.047  
005112.13-725656.2 0.08 16.196 -0.082 0.09 0.034 52, ART
005141.43-731129.9 0.051 16 -0.123 0.024 0.091  
005147.58-730924.7 0.066 15.629 -0.073 0.077 0.045  
005456.92-731200.4 0.056 16.344 -0.156 -0.143 0.01  
005651.99-724027.1 0.059 15.735 -0.065 -0.015 0.067  
005854.06-722841.9 0.114 17.014 -0.04 0.134 0.042  
010701.71-724754.9 0.036 15.601 -0.152 -0.053 0.021  


3.3 Type-3 stars

In these periodic objects, we searched for periods longer than 0.2 days using a variety of period searching algorithms implemented in graphic C-routines written by us, and also in IRAF. We found periodicities in the range of 17 to 720 days. The accuracy for periods longer than 200 days is low, and these variations can easily be quasi-periodic rather than strictly periodic. 51% of the periods were found in the range of 17-100 days. The mean period was 135 days. Many of the stars showed significant aliases in the periodogram in addition to the main period, and 2 showed evidence of a variable period. Five stars turned out to be eclipsing binaries, with evidence of additional variability not related to changing aspects of the binary system. In general, type-3 stars were redder when brighter. All the relevant information is given in Table 5. The 9 type-3 stars in our sample with periods longer than 200 days have V-I colours in the range of 0.0-0.2 mag, and B-V colours in the range of -0.1-0.0 mag. They correspond to stars with visual magnitudes between 15.5 and 18.0 mag. In general, type-3 stars show similar colours than the other types of stars we are discussing, but they appear more homogeneously distributed in Figs. 7 and 8, with a tendency to concentrate in the red part of the colour-colour diagram.

 

 
Table 5: Type-3 stars. ART means "after-removing-trend", ChP changing period, LA low amplitude, MA multiple aliases, and VA variable amplitude.

Star
$\Delta \Phi $ V B-V V-I rms Period (days)

003813.22-734144.7
0.291 16.607 -0.045 0.022 0.058 $187\pm19$
003832.82-734404.2 0.385 17.447 0.448 0.609 0.106 $79\pm3$, MA
003833.35-731510.1 0.177 16.467 0.019 0.084 0.064 $164\pm3$
003927.34-733309.6 0.322 15.855 -0.158 0.057 0.055 $\sim$27, ART, MA
003952.15-730057.7 0.53 18.815 -0.042 0.022 0.077 $107\pm6$, double eclipse?
004019.36-730402.9 2.172 16.207 -0.033 0.146 0.059 $200\pm22$, VA
004024.94-734416.1 1.58 16.531 -0.018 0.04 0.01 $\sim$448
004211.38-732437.7 0.345 17.916 -0.089 0.01 0.058 $74\pm3$
004212.21-734120.0 0.017 15.921 -0.197 -0.138 0.039 $46\pm1$, alias 1.01932
004323.84-733930.1 0.636 16.341 -0.19 -0.145 0.016 $62\pm2$, alias 0.98134
004336.91-732637.7 0.097 14.178 0.181 0.331 0.031 $118\pm7$, MA
004357.18-732019.9 0.139 16.51 0.386 0.668 0.065 $29\pm1$
004454.66-732802.9 0.183 14.817 0.286 0.576 0.03 $17.37\pm0.15$, VA
004517.55-732343.6 0.044 17.513 0.306 0.222 0.094 $171\pm15$
004541.10-731219.2 0.082 17.149 0.089 0.24 0.032 $182\pm18 $
004541.80-724932.3 0.046 17.252 0.308 0.48 0.206 $85\pm3$
004554.14-731404.3 0.781 15.483 0.517 0.709 0.01 $99\pm4$, LA
004633.06-731919.1 0.129 17.15 -0.012 0.181 0.021 $38\pm1$, ART
004633.76-731204.3 0.092 14.058 0.206 0.385 0.057 $184\pm18$, eclipsing
004652.03-731423.7 0.084 15.995 -0.069 0.087 0.021 $\sim$567, other 67?
004653.24-724300.0 0.495 19.469 0.03 0.12 0.166 $66\pm3$
004702.75-730618.3 0.126 16.57 0.122 0.243 0.016 $17.3\pm0.15$, ART, eclipsing
004723.53-730347.0 0.11 16.328 -0.043 0.162 0.016 $101\pm2$, ART, eclipsing
004748.20-731906.1 0.073 18.355 0.194 0.392 0.079 $177\pm10 $
004750.14-731316.4 0.222 15.475 0.269 0.471 0.009 $30.0\pm0.3$, LA
004816.01-730635.7 0.212 15.917 0.123 0.338 0.04 $26.45\pm0.20$, strange phase curve, also type-1?
004833.67-732955.6 0.221 19.403 0.129 0.417 0.14 $161\pm12$
004843.23-731415.8 0.111 16.736 -0.081 0.066 0.062 $\sim$357, VA
004849.06-724309.2 0.088 17.588 0.446 0.639 0.108 $150\pm15$, rather time-scale



 

 
Table 6: Type-4 stars.

Star
$\Delta \Phi $ V B-V V-I rms

003618.14-734624.6
0.086 14.929 0.353 0.779 0.279
003618.15-734247.4 1.419 16.177 -0.131 -1E-3 0.036
003619.44-732553.1 0.132 19.519 0.258 0.516 0.182
003621.53-732610.6 0.05 14.741 0.067 0.214 0.124
003623.02-734651.0 0.016 19.551 0.484 0.531 0.304
003645.28-733259.7 1.863 15.59 -0.024 0.2 0.015
003652.74-732857.9 3.222 14.397 0.081 0.177 0.016
003715.60-734546.0 1.804 16.09 0.453 0.647 0.013
003726.27-731420.0 0.511 19.63 0.318 0.559 0.25
003730.99-731112.4 1.965 15.846 0.109 0.209 0.01
003744.41-730447.6 0.109 16.996 -0.087 -0.051 0.028
003804.71-735150.5 0.329 19.434 0.009 0.092 0.065
003810.16-730138.4 1.22 17.296 0.59 0.767 0.02
003813.77-731340.0 0.208 17.335 -0.081 0.116 0.016
003817.01-734852.6 0.025 15.199 0.462 0.709 0.28
003827.69-733314.5 1.499 16.126 -0.156 0.124 0.021
003833.29-732629.4 1.317 16.725 0.414 0.619 0.011
003836.25-734813.4 0.303 15.383 -0.14 -0.082 0.022
003837.66-731158.3 0.093 14.894 -0.085 0.057 0.028


3.4 Type-4 stars


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f3.eps}
\end{figure} Figure 3: Examples of type-1/type-2 Be star candidates showing outbursts and high-low states.
Open with DEXTER


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f4.eps}
\end{figure} Figure 4: Examples of type-2 Be star candidates showing high and low states.
Open with DEXTER


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f5.eps}
\end{figure} Figure 5: Examples of type-3 Be star candidates showing periodic oscillations.
Open with DEXTER


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f6.eps}
\end{figure} Figure 6: Examples of type-4 Be star candidates showing random variability.
Open with DEXTER

They are the most numerous in our sample, sharing colour ranges with the other types of variables. They usually show stochastic variability in time scales running from days to years (Fig. 6). In some occasions we observed quasi-periodic oscillations on time scales of weeks, and in others short-duration, eclipse-like events. Information on type-4 stars is given in Table 6.

4 Discussion

We have reviewed the literature in order to find out if our stars have already been detected as variable stars by other surveys. In the original sample of 5168 objects, we found 8 stars classified as Be stars by Keller et al. (1999). We classified four of them as type-4 (ngc 330/219, ngc 330/235, ngc 346/259 and ngc 346/377), and the others were missed by our visual inspection search method since they show I-band rms lower than 0.02 mag (ngc 330/238, ngc 330/1054, ngc 330/1064 and ngc 330/1239). We also found one type-4 star listed as extreme Be-star by Garmany & Humphreys (1985, their star AV433). Another two type-4 stars are listed as Be/X-ray binaries and one as possible Be/X-ray binary in the compilation by Haberl & Sasaki (2000, their stars 20, 23 and 6, respectively). The fact that eight type-4 stars have been previously classified as Be stars or Be/X-ray binaries suggests that all type-4 stars might be related with Be stars in some way. Their light curve morphology, quite similar to Galactic Be stars, supports this conjecture.

Type-1 light curves are reminiscent of those observed in FU Orionis stars, thought to be caused by accretion events in protostellar disks around young solar-type stars. There is a notable similarity between the shape of the sharp type-1 outbursts with those observed in the extreme classical T Tauri star EX Lupi (Herbig et al. 2001) and the FU Ori star V 1057 Cyg (Bell et al. 1995). However, the amplitude and duration of the outbursts are respectively factors 20 and 1000 smaller in type-1 stars. On the other hand, the general appearance of type-2 light curves, i.e., a rapid rise of luminosity followed by a "plateau'' of rather constant brightness resemble (except for a scale factor) the initial stages of the outbursts observed in V1515 Cyg and FU Ori (Bell et al. 1995). Type-1 light curves are also quite similar in shape to those observed in cataclysmic variables (CVs) of the dwarf novae type. However, these objects experience in general much larger amplitude outbursts ($\sim$2-7 mags), have a rather constant luminosity at maximum and usually return to the same quiescence level after outburst.

The outbursts observed in CVs and FU Ori stars have been modeled by mass transfer instabilities in accretion disks (Meyer & Meyer-Hofmeister 1981; Bell et al. 1995). A heating front propagates across the disk after a certain critical density is reached, pushing the disk into a hot state with high mass transfer rate and consequently high accretion luminosity. Rapid outburst rising times can be produced by outbursts starting in the outer disk and propagating inwards, and slower rising times can be produced by outbursts triggered in the inner disk and propagating outwards. We can speculate that the same phenomenon responsible for FU Ori outbursts is also present in more massive young stars, producing light curve patterns like the ones observed in type-1 and type-2 stars. In this view, the smaller outburst amplitude and shorter duration of type-1 outburst when compared with those observed in FU Ori stars should correspond to accretion of matter with lower mass transfer rates. Sharp and hump-like outbursts should correspond to outside-in and inside-out outbursts, respectively. Type-2 stars could be explained by outside-in outbursts followed by a sustained period of a high mass-transfer rate. A characteristic of the FU Ori outbursts is their larger amplitude at shorter wavelengths, contrary to what is observed in type-1 stars. However, dwarf novae are redder at maximum.

In connection with the above ideas, it is interesting that one of our objects classified as type-1 was identified by Beaulieu et al. (2001) as a possible pre-main sequence star (ESHC2). In principle, this is in contradiction with the Cook et al. (1995) classification of some of these objects as Be stars. It is possible that the presence of Balmer emission not necessarily implies a Be star classification for the "bumpers" detected in the LMC by Cook and collaborators. In fact, the low ionization metal absorption lines usually found in optical spectra of Herbig Ae/Be stars could be hard to detect in low metallicity stellar photospheres like those found in the SMC and LMC. Therefore, it is reasonable to ask if perhaps all of type-1 and type-2 objects are actually pre-main sequence stars with FU Ori-like accretion disk activity. In this case, the mass accretion rates need to be much higher than those observed in normal Be star discs, or even in Be/X-ray binaries, to yield luminosities comparable or larger than the luminosity of the accreting B-type star. Since the nebulosities defining Herbig Ae/Be objects cannot be resolved at the distance of the Magellanic Clouds, the answer to the above question needs to await future spectroscopic studies, especially in the infrared, and possibly very high-resolution imaging studies which could reveal the surrounding nebulosities. We must keep in mind, however, that Hipparcos photometry of Galactic Herbig Ae/Be stars apparently does not reveal type-1 like activity (van den Ancker et al. 1998). Also, the optical light of some Galactic Be stars showing outbursts, like $\lambda$ Eri and $\mu$ Cen, is apparently dominated by the stellar continuum during quiescence, and the spectrum does not reveal the strong emission lines typical of massive Herbig Ae/Be envelopes. Although it is not clear if these Galactic Be stars are the same kind of object that type-1/type-2 stars, we recognize that these two facts are the weak points in the pre-main sequence scenario. We therefore offer an alternative explanation in the next paragraph.

Type-1 star outbursts resemble also in shape the optical outbursts observed in some Be/X-ray binaries (e.g. A 0538-66, Densham et al.  1983), except for their much smaller amplitudes and redder colours. It is currently assumed that in these objects a neutron star companion undergoes episodes of mass accretion when passing through the envelope of a Be star primary (e.g., Okazaki & Negueruela 2001). These high-energy phenomena are no doubt relevant in the X-ray domain, but should not show up at optical and near infrared wavelengths. In addition, the optical counterparts of Galactic and Magellanic Cloud Be/X-ray binaries have spectral types earlier than B2 (Negueruela 1998). This is in principle contrary to the distribution of B-V colours in Fig. 7. However, the similarity between the X-ray type-I and type-II outbursts observed in Be/X-ray binaries and the narrow and hump-like outburst observed in type-1 stars suggest that they could be due to accretion by a white dwarf, not a neutron star. The Be+WD system should produce less energetic outburst, eventually much prominent in the optical and infrared. Favouring this hypothesis is the fact that many Be+WD binaries, even with late-type B stars, are expected from evolutionary calculations (Raguzova 2000; Waters et al. 1989). Only few candidates for these systems have been found up to now, likely due that the white dwarfs, if present, should be hard to detect (Apparao 1991). The hypothesis of accreting white dwarf companions would naturally explain some of the type-1 light curves. The same model for periodic X-ray outbursts in Be/X-ray binaries by Okazaki & Negueruela (2001) could eventually be applied to Be+WD systems. In this model, periodic narrow outbursts occur in systems with high orbital eccentricity, every time that the compact object captures gas from the disc at every periastron passage. Hump-like outbursts occurs in systems with low eccentricity, when the outer disc eventually passes beyond the orbit of the companion. Accordingly to Apparao (1991), observations of time delays between enhancements of optical line and continuum emission could identify Be stars with white dwarf companions. We must keep in mind, that only a small fraction of type-1 objects shows periodic or quasiperiodic outbursts, however.

Concerning type-3 stars, they can be ruled out to be Cepheids, since their large periods (sometimes hundreds of days) are incompatible with their inferred luminosities. On the other hand, the periods are one or two orders of magnitude longer than those observed in Galactic pulsating B stars. This hints at the possibility that type-3 variability is linked to the envelope rather than to the star itself. There is evidence for global one-armed oscillations in the envelopes of Galactic Be stars (Okazaki 1997), but the associated photometric variations are not so strictly periodic as those observed in type-3 stars, the time-scales are longer, about 7 years in average, and, from a theoretical point of view, the oscillations are expected to disappear in the low metallicity environment of the SMC or, alternatively, to slow down, yielding periods in excess of several years (Hummel et al. 2001), in disagreement with the observed type-3 oscillations. The distribution of type-3 stars in the colour-colour diagram of Fig. 8 suggests that these stars are perhaps not be linked to the Be star phenomenon at all. Preliminary spectroscopy of one type-3 object seems to corroborate this view. It shows double H$\alpha$ emission with a deep central absorption and total equivalent width $\sim$100 Å, too large for an isolated Be star (Mennickent et al.  in preparation). We speculate that type-3 stars could be young objects with massive envelopes ongoing some kind of oscillation.

5 Conclusions

We have presented a sample of $\sim$1000 Be star candidates in the Small Magellanic Cloud, giving positions and basic photometric information along with periodicities when present. Many of these objects show apparently new kinds of photometric variability never seen before, and this feature enabled us to carry out an empirical classification based on the light curve appearance. There is evidence that some of these objects are truly Be stars, but spectroscopy is needed to confirm this suspicion. On the other hand, the hypothesis that at least part of the type-1 and type-2 stars are Be-stars with accreting white dwarfs, or alternatively, pre-main sequence stars showing accretion disk instabilities, should be studied more thoroughly.


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f7.eps}
\end{figure} Figure 7: The V vs. B-V diagram for the sample stars. Blue dots correspond to type-1 stars, red dots to type-2 stars, green dots to type-3 stars, circles to type-4 stars and black dots to type-1 stars showing high and low states, as type-2 stars. The track of the main sequence (Allen 2000) is shown for reference. Note the sharp cut-off at the blue edge.
Open with DEXTER


  \begin{figure}
\includegraphics[width=8.8cm,clip]{h1030f8.eps}
\end{figure} Figure 8: The V-I vs. B-V diagram for the sample stars. The track of the main sequence (Allen 2000) is shown as a reference. Meaning of the symbols are as in Fig. 7.
Open with DEXTER

The understanding of the phenomena causing the photometric variability of the stars discussed in this paper requires knowledge of the spectral energy distributions of these stars. We plan to discuss, in a forthcoming paper, the detailed photometric properties of these objects along with spectroscopic data. It should be interesting to test the accretion scenario for type-1 stars. Since the theory of accretion is rather well developed, it could be a source of physical information about the environments surrounding these objects. We also plan to search the OGLE-II database for Be stars in the Large Magellanic Cloud. It should be interesting to investigate if the same types of light curves are observed in the LMC, whose metallicity is intermediate between the SMC and our Galaxy, and how the light curve properties are modified by the change in metallicity.

Acknowledgements

This work was supported by Grant Fondecyt 1000324 and DI UdeC 202.011.030-1.0. The authors are very grateful to Professor Bohdan Paczynski for many interesting suggestions on this paper. We would also like to thank the OGLE collaboration for making their data public domain, thus enabling us to carry out this research. We also acknowledge the anonymous referee who made valuable comments to improve a first version of this manuscript.

References

 

Online Material


 
Table 1: Type-1 stars.
Star $\Delta\Phi$ V B-V V-I rms
OGLE003623.36-733922.3 0.601 16.158 -0.233 -0.212 0.012
OGLE003832.64-732234.9 0.076 15.264 -0.139 -0.117 0.01
OGLE003918.20-733656.6 0.245 14.548 0.484 0.714 0.017
OGLE003922.09-732531.6 0.031 16.931 -0.041 -0.146 0.019
OGLE004036.15-732921.6 0.04 16.548 0.13 -0.03 0.062
OGLE004207.86-734501.9 0.136 16.804 -0.055 0.049 0.02
OGLE004215.08-731710.4 0.097 15.966 -0.157 -0.055 0.019
OGLE004231.84-732200.9 0.024 15.376 -0.106 -0.019 0.077
OGLE004326.72-725910.3 0.439 16.858 -0.128 -0.127 0.018
OGLE004502.43-732318.6 0.137 16.777 -0.048 0.039 0.012
OGLE004624.69-724657.3 0.609 19.333 0.203 0.463 0.045
OGLE004624.74-731941.7 0.102 15.851 0.069 0.169 0.09
OGLE004631.41-730335.6 0.085 17.113 -0.118 -0.002 0.04
OGLE004646.81-731849.2 0.054 16.701 -0.013 0.207 0.015
OGLE004650.39-731017.7 0.092 15.513 -0.105 -0.022 0.014
OGLE004653.17-732330.2 0.327 15.252 -0.033 0.012 0.014
OGLE004717.43-725227.6 0.119 17.071 0.353 0.403 0.136
OGLE004757.42-731050.8 0.122 15.714 -0.036 0.041 0.02
OGLE004800.14-730728.6 0.055 16.354 -0.226 0.046 0.101
OGLE004803.08-725404.2 0.347 16.704 -0.127 -0.126 0.015
OGLE004809.31-732028.9 0.298 15.594 -0.165 -0.134 0.019
OGLE004814.06-732203.5 0.098 14.906 -0.17 -0.124 0.175
OGLE004815.63-731022.8 0.113 16.352 0.482 0.745 0.026
OGLE004833.67-732955.6 0.221 19.403 0.129 0.417 0.14
OGLE004847.74-732026.3 0.031 16.575 0.032 0.156 0.014
OGLE004857.01-730856.4 0.088 16.989 0.212 0.366 0.053
OGLE004903.51-730441.3 0.045 17.208 -0.039 -0.01 0.018
OGLE004911.46-724937.0 0.079 15.721 0.071 0.196 0.204
OGLE004911.88-730854.8 0.096 16.121 -0.018 0.006 0.017
OGLE004912.79-725948.5 0.245 16.95 -0.081 -0.028 0.026
OGLE004914.12-731652.0 0.092 15.329 -0.05 0.106 0.033
OGLE004924.46-731226.8 0.054 15.769 -0.04 0.033 0.036
OGLE004925.37-730058.8 0.121 16.811 -0.061 0.119 0.036
OGLE004942.00-732314.2 0.251 14.975 0.046 0.248 0.02
OGLE004951.50-725730.6 0.072 15.874 0.046 0.167 0.129
OGLE005011.58-725459.5 0.055 16.006 0.126 0.48 0.025
OGLE005025.61-725136.0 0.462 16.665 -0.219 -0.05 0.075
OGLE005026.02-725131.2 0.438 16.837 -0.211 -0.006 0.103
OGLE005039.13-724154.3 0.063 18.871 0.265 0.566 0.027
OGLE005042.39-730930.5 0.021 15.899 -0.045 0.182 0.049
OGLE005045.58-730253.9 0.395 16.313 0.05 0.154 0.017
OGLE005057.76-731958.5 0.069 16.199 -0.069 0.062 0.029
OGLE005059.21-724357.3 0.172 14.805 -0.02 0.352 0.034
OGLE005120.56-724325.0 0.01 15.774 -0.091 0.227 0.052
OGLE005130.91-725549.8 2.081 18.66 -0.056 0.359 0.123
OGLE005153.47-724009.2 0.132 15.421 -0.129 -0.159 0.012
OGLE005154.82-731616.1 0.03 15.479 -0.131 -0.128 0.011
OGLE005215.39-731915.0 0.014 15.916 -0.099 -0.035 0.053
OGLE005217.38-731926.0 0.059 15.981 -0.12 -0.071 0.025
OGLE005224.40-724038.6 0.042 14.032 0.003 0.021 0.26
OGLE005227.51-732001.2 0.123 13.186 1E-3 0.048 0.018
OGLE005228.02-731539.5 0.026 16.592 -0.138 -0.092 0.031
OGLE005232.63-731707.2 0.056 17.012 -0.055 0.066 0.024
OGLE005246.43-732424.2 0.087 17.852 -0.042 0.123 0.033
OGLE005252.49-731833.5 0.05 15.254 0.163 0.57 0.178
OGLE005256.10-725326.6 0.165 16.524 -0.118 -0.021 0.021
OGLE005258.18-724410.5 0.151 15.475 -0.075 0.235 0.028
OGLE005302.77-731759.1 0.018 15.079 -0.007 0.132 0.053
OGLE005307.87-724727.7 0.04 16.668 -0.238 0.034 0.081
OGLE005347.05-730608.6 0.225 15.443 -0.174 -0.144 0.019
OGLE005356.76-731029.2 0.032 15.049 -0.148 0.184 0.067
OGLE005358.65-731018.0 0.126 17.73 -0.047 0.024 0.019
OGLE005451.66-723910.8 0.157 16.004 -0.012 -0.058 0.039
OGLE005504.55-724637.3 0.253 14.156 -0.111 -0.178 0.02
OGLE005516.89-724607.1 0.443 15.837 -0.166 -0.18 0.02
OGLE005523.54-725528.8 0.089 16.318 0.014 -0.336 0.084
OGLE005531.38-730439.3 0.083 16.052 -0.138 -0.099 0.014
OGLE005614.63-723755.1 0.045 14.568 0.05 0.349 0.008
OGLE005626.60-722622.9 0.122 16.167 -0.107 -0.099 0.029
OGLE005641.86-724425.4 0.137 14.717 -0.113 -0.137 0.007
OGLE005837.83-721628.8 0.109 16.086 -0.091 0.095 0.017
OGLE005854.41-724352.3 0.116 15.048 -0.182 -0.153 0.027
OGLE005904.99-722252.3 0.048 15.788 -0.061 0.083 0.018
OGLE005916.06-722100.3 0.024 14.512 -0.034 0.16 0.072
OGLE005929.29-723103.7 0.141 16.124 -0.116 -0.083 0.009
OGLE005939.44-725241.5 0.022 15.352 0.102 0.113 0.309
OGLE010041.93-723028.6 0.149 14.73 -0.178 -0.19 0.031
OGLE010043.94-722604.8 0.157 14.508 -0.194 -0.164 0.026
OGLE010056.79-721635.2 0.221 15.195 -0.161 -0.038 0.022
OGLE010058.69-723049.9 0.112 13.957 -0.089 0.015 0.026
OGLE010104.52-722023.4 0.024 15.251 -0.028 0.138 0.012
OGLE010137.82-721844.4 0.041 15.562 -0.147 0.007 0.072
OGLE010144.76-723405.3 0.795 16.976 -0.148 -0.015 0.012
OGLE010150.83-721102.4 0.01 16.243 -0.207 -0.043 0.034
OGLE010201.88-721512.1 0.067 17.666 -0.265 -0.156 0.039
OGLE010213.80-722213.0 0.015 14.376 0.035 0.229 0.01
OGLE010237.04-725943.8 0.044 17.672 0.369 0.57 0.202
OGLE010244.01-722954.7 0.121 15.103 -0.078 0.134 0.022
OGLE010350.50-724853.2 0.128 14.989 -0.159 -0.094 0.039
OGLE010353.59-724908.0 0.05 16.012 -0.01 0.3 0.021
OGLE010422.27-723534.5 0.075 17.701 -0.14 -0.101 0.019
OGLE010542.57-722747.3 0.037 14.794 0.052 0.279 0.029
OGLE010603.21-724931.1 0.068 14.801 -0.086 0.028 0.057
OGLE010615.06-725741.9 0.312 16.008 0.041 0.174 0.068
OGLE010621.11-721603.7 0.071 15.292 -0.147 -0.106 0.033
OGLE010710.78-722216.2 0.462 17.191 0.588 0.722 0.013
OGLE010712.24-722218.9 0.331 15.09 0.022 0.147 0.021
OGLE010740.60-722237.3 1.705 18.274 0.325 0.607 0.024
OGLE010744.20-722740.9 0.165 15.482 -0.08 0.227 0.045
OGLE010807.38-721932.6 0.071 14.189 -0.181 -0.12 0.034
OGLE010809.52-721556.8 0.116 14.484 -0.183 -0.097 0.03
OGLE010825.82-722327.2 0.092 13.969 -0.031 0.206 0.034


 
Table 3: Type-2 stars.
Star $\Delta\Phi$ V B-V V-I rms
OGLE004234.39-733058.2 0.043 15.989 -0.148 0.002 0.021
OGLE004258.05-730230.7 0.036 16.059 0.028 0.176 0.019
OGLE004319.46-731705.7 0.099 16.403 -0.056 0.132 0.032
OGLE004330.69-732034.2 0.028 16.428 -0.194 -0.177 0.009
OGLE004414.25-731215.5 0.086 17.297 -0.107 -0.028 0.023
OGLE004443.05-731316.5 0.068 16.217 -0.072 0.028 0.017
OGLE004504.35-724449.9 0.076 17.906 0.336 0.549 0.051
OGLE004510.40-731648.1 0.104 15.855 -0.105 -0.022 0.009
OGLE004539.31-731040.1 0.433 17.849 -0.104 0.702 0.088
OGLE004546.74-733233.1 0.008 16.284 -0.032 0.158 0.032
OGLE004556.84-730919.8 0.068 17.128 -0.057 0.031 0.013
OGLE004601.22-731821.9 0.11 16.374 0.033 0.255 0.018
OGLE004610.97-732535.2 0.037 15.439 0.009 0.032 0.146
OGLE004633.48-730352.1 0.026 15.489 -0.066 0.063 0.04
OGLE004639.77-725241.0 0.047 15.614 -0.179 -0.173 0.011
OGLE004651.07-730215.3 0.048 15.801 -0.026 0.176 0.026
OGLE004655.32-731207.6 0.094 16.164 -0.113 0.103 0.03
OGLE004714.29-731044.0 0.09 17.635 -0.022 0.043 0.022
OGLE004714.53-731349.7 0.131 15.068 -0.196 -0.172 0.009
OGLE004719.31-732533.6 0.11 16.449 -0.074 0.145 0.073
OGLE004721.86-730650.1 0.074 14.026 -0.029 0.186 0.007
OGLE004732.99-731531.6 0.103 15.23 0.089 0.255 0.037
OGLE004735.47-732248.2 0.03 16.926 0.039 0.289 0.036
OGLE004748.07-730140.3 0.022 16.338 -0.031 0.185 0.012
OGLE004748.70-731752.4 0.356 18.438 -0.002 0.024 0.022
OGLE004748.79-730519.4 0.2 16.503 0.028 0.278 0.016
OGLE004756.74-730308.4 0.157 15.807 -0.054 0.172 0.014
OGLE004801.18-731523.5 0.099 17.095 0.04 0.264 0.085
OGLE004812.73-731201.0 0.139 17.265 -0.004 0.097 0.017
OGLE004817.65-730933.6 0.189 17.123 0.05 0.276 0.025
OGLE004822.43-725856.8 0.061 17.324 -0.093 -0.065 0.014
OGLE004832.21-724558.5 0.093 17.593 -0.15 -0.043 0.029
OGLE004839.28-730828.6 0.066 16.617 -0.184 -0.106 0.045
OGLE004847.09-732004.4 0.68 16.714 0.245 0.436 0.107
OGLE004848.83-730620.1 0.026 14.382 -0.04 0.114 0.056
OGLE004849.49-724800.0 0.126 15.138 0.207 0.388 0.044
OGLE004853.10-731409.8 0.098 14.919 -0.106 0.026 0.013
OGLE004853.63-730822.9 0.178 17.377 0.382 0.668 0.018
OGLE004854.10-725526.1 0.089 16.316 -0.052 1E-3 0.024
OGLE004905.07-731832.0 0.081 15.87 -0.07 -0.017 0.085
OGLE004909.39-731831.9 0.378 16.625 0.029 0.209 0.02
OGLE004909.67-724839.2 0.045 16.928 0.159 0.127 0.063
OGLE004918.21-732039.3 0.129 16.416 -0.102 -0.011 0.016
OGLE004926.12-731632.5 0.092 15.966 -0.088 0.139 0.114
OGLE004926.81-730601.4 0.067 16.283 -0.047 0.058 0.036
OGLE004935.11-732320.4 0.041 15.91 -0.036 0.06 0.045
OGLE004938.01-730610.0 0.029 14.435 -0.123 0.105 0.082
OGLE004954.54-732114.6 0.101 15.865 -0.053 0.167 0.027
OGLE004954.93-730751.4 0.042 16.667 0.017 0.026 0.031
OGLE005007.91-732910.0 0.055 17.204 -0.049 0.056 0.015
OGLE005010.70-730654.6 0.063 16.451 0.031 0.244 0.056
OGLE005011.50-730652.1 0.164 15.583 -0.131 0.056 0.055
OGLE005014.55-725941.8 0.035 17.038 -0.222 -0.15 0.076
OGLE005038.60-725344.1 0.034 16.681 -0.131 0.004 0.026
OGLE005041.48-724537.7 0.046 15.677 -0.099 0.13 0.063
OGLE005043.72-730147.0 0.157 16.484 0.064 0.303 0.015
OGLE005053.87-724716.6 0.056 16.708 -0.131 -0.047 0.028
OGLE005104.25-730821.9 0.13 17.343 -0.2 0.032 0.123
OGLE005108.72-725623.6 0.058 15.49 -0.087 0.041 0.094
OGLE005108.86-724051.8 0.09 15.475 -0.094 0.034 0.021
OGLE005112.72-731151.1 0.075 18.187 -0.037 0.184 0.023
OGLE005115.43-730803.1 0.057 15.747 0.076 0.299 0.025
OGLE005117.02-730446.8 0.043 15.572 -0.157 0.002 0.024
OGLE005117.54-730254.4 0.06 15.618 -0.204 -0.052 0.049
OGLE005123.29-725756.0 0.155 16.553 -0.014 0.244 0.028
OGLE005130.68-731355.2 0.048 17.308 -0.101 -0.029 0.018
OGLE005131.35-725054.2 0.147 17.983 0.023 0.146 0.106
OGLE005131.37-725054.2 0.092 18.039 0.098 0.177 0.102
OGLE005132.33-725218.2 0.024 16.741 -0.046 0.205 0.027
OGLE005134.85-731843.2 0.135 16.018 -0.149 -0.089 0.017
OGLE005134.86-731843.2 0.012 16.065 -0.197 -0.048 0.021
OGLE005135.29-723237.6 0.108 16.451 -0.241 -0.104 0.035
OGLE005137.19-731429.2 0.068 17.244 0.027 0.275 0.04
OGLE005145.65-724358.3 0.123 16.271 -0.07 0.229 0.111
OGLE005152.30-730904.2 0.682 16.658 -0.104 0.056 0.019
OGLE005156.68-724116.8 0.12 15.866 -0.155 -0.037 0.026
OGLE005206.05-725208.7 0.027 15.961 -0.148 0.054 0.063
OGLE005209.29-731711.6 0.09 15.857 -0.078 -0.024 0.023
OGLE005209.92-731820.4 0.015 15.672 -0.15 -0.156 0.013
OGLE005211.60-730049.1 0.018 17.013 -0.144 -0.139 0.036
OGLE005212.06-723723.4 0.095 15.658 -0.027 0.165 0.056
OGLE005212.34-731008.3 0.128 15.535 -0.09 0.042 0.068
OGLE005212.69-730037.5 0.09 16.02 -0.164 -0.071 0.019
OGLE005222.36-730239.2 0.013 16.423 -0.064 0.155 0.022
OGLE005222.51-731842.7 0.03 15.867 0.042 0.146 0.03
OGLE005224.40-724038.6 0.042 14.032 0.003 0.021 0.26
OGLE005235.39-725050.1 0.251 15.065 -0.052 0.199 0.016
OGLE005237.21-730901.2 0.043 16.955 -0.181 -0.136 0.026
OGLE005241.79-732404.1 0.05 16.262 -0.078 -0.017 0.029
OGLE005243.27-731812.2 0.1 17.522 -0.18 0.041 0.035
OGLE005251.97-723508.5 0.076 14.637 -0.158 0.257 0.073
OGLE005254.57-730648.7 1.213 18.374 -0.088 -0.203 0.05
OGLE005300.82-731638.7 0.169 16.151 -0.071 0.215 0.037
OGLE005310.28-730325.4 0.023 16.041 -0.03 0.106 0.041
OGLE005312.20-724842.9 0.049 16.523 -0.137 0.097 0.047
OGLE005338.91-724026.9 0.182 15.926 -0.045 0.219 0.016
OGLE005339.70-724042.1 0.271 15.091 0.026 0.271 0.027
OGLE005341.39-725253.4 0.042 16.006 -0.033 0.174 0.043
OGLE005341.70-730130.7 0.128 15.254 -0.213 -0.155 0.044
OGLE005342.40-725116.7 0.229 16.947 -0.174 -0.156 0.02
OGLE005348.08-730348.2 0.069 16.557 -0.143 -0.107 0.022
OGLE005352.47-724624.4 0.238 16.399 0.075 0.13 0.027
OGLE005416.84-731147.8 1.114 17.984 -0.2 0.027 0.029
OGLE005427.52-731359.0 0.193 16.633 0.016 0.057 0.014
OGLE005433.24-723211.5 0.181 16.446 -0.101 0.281 0.064
OGLE005440.67-723028.4 0.018 15.312 -0.169 -0.171 0.007
OGLE005453.63-723529.2 0.136 15.377 -0.178 -0.156 0.019
OGLE005506.26-731347.5 0.067 15.739 -0.153 0.047 0.011
OGLE005548.22-731828.4 2.842 18.72 -0.112 -0.144 0.028
OGLE005614.45-724053.2 0.216 14.348 0.295 0.476 0.017
OGLE005618.51-722645.2 0.553 13.912 0.046 0.146 0.005
OGLE005642.51-723508.6 0.05 15.326 -0.152 0.003 0.037
OGLE005705.71-723341.8 0.106 16.14 -0.178 -0.124 0.035
OGLE005727.09-723721.8 0.207 18.007 -0.124 -0.068 0.022
OGLE005729.42-721550.4 0.106 15.439 -0.132 0.143 0.069
OGLE005735.61-721754.9 0.117 16.153 -0.07 0.114 0.05
OGLE005744.30-721610.6 0.053 15.582 -0.161 -0.133 0.011
OGLE005806.05-723544.5 0.099 14.838 -0.007 0.071 0.016
OGLE005844.81-724435.6 0.039 15.919 -0.009 0.246 0.021
OGLE005845.21-723651.9 0.079 15.123 -0.033 0.278 0.016
OGLE005853.13-722023.4 0.065 15.642 0.002 0.199 0.018
OGLE005858.73-725220.9 0.074 14.827 -0.1 0.04 0.035
OGLE005901.96-723911.0 0.154 15.444 0 0.284 0.012
OGLE005912.13-721211.4 0.051 15.824 0.073 0.274 0.017
OGLE005932.85-724358.7 0.061 16.952 -0.12 -0.032 0.022
OGLE005938.00-722734.5 0.162 17.459 -0.217 -0.089 0.047
OGLE010009.17-722159.3 0.08 16.29 -0.005 0.215 0.009
OGLE010025.10-724632.2 0.109 14.704 -0.106 -0.029 0.07
OGLE010027.11-722657.5 0.053 17.743 -0.113 -0.089 0.037
OGLE010055.96-722321.3 0.108 15.787 -0.128 -0.012 0.02
OGLE010149.74-722818.7 0.079 15.849 -0.206 -0.076 0.094
OGLE010156.61-721526.4 0.053 16.265 -0.119 -1E-3 0.021
OGLE010210.38-724422.6 0.031 16.252 -0.101 -0.144 0.007
OGLE010215.48-723557.2 0.056 16.164 -0.051 -0.076 0.031
OGLE010309.31-724553.2 0.274 16.655 -0.059 -0.076 0.019
OGLE010322.56-724950.6 0.427 16.977 -0.099 0.122 0.027
OGLE010337.46-720416.9 0.033 15.179 -0.135 0.074 0.041
OGLE010401.11-723311.1 0.079 13.12 -0.019 0.124 0.013
OGLE010405.20-724334.2 0.128 14.923 -0.021 0.181 0.012
OGLE010415.39-724829.3 0.042 16.422 -0.111 0.145 0.012
OGLE010415.81-722618.8 0.135 14.971 -0.02 0.239 0.013
OGLE010447.25-722559.4 0.222 14.781 -0.084 0.14 0.017
OGLE010450.00-720225.2 0.072 15.42 -0.128 0.064 0.023
OGLE010507.19-722644.3 0.093 15.305 -0.109 0.018 0.012
OGLE010544.48-722807.5 0.082 16.069 -0.186 -0.191 0.019
OGLE010554.27-722841.9 0.084 15.965 -0.077 0.101 0.01
OGLE010642.82-721527.3 0.102 15.736 -0.213 -0.234 0.01
OGLE010649.98-721621.0 0.023 15.034 -0.137 -0.015 0.057
OGLE010720.35-723929.1 0.107 17.247 -0.152 -0.097 0.02
OGLE010743.07-722148.1 0.026 15.199 -0.076 0.204 0.039
OGLE010744.48-722747.1 0.144 16.199 -0.199 -0.101 0.012
OGLE010755.71-723506.9 0.009 15.524 -0.068 0.073 0.077
OGLE010822.18-723716.8 0.035 15.367 -0.164 -0.107 0.04
OGLE010837.86-723021.6 0.089 16.658 -0.113 0.033 0.054


 
Table 5: Type-3 stars.

Star
$\Delta\Phi$ V B-V V-I rms Time-scale (days)

OGLE003813.22-734144.7

0.291 16.607 -0.045 0.022 0.058 187$\pm$19
OGLE003832.82-734404.2 0.385 17.447 0.448 0.609 0.106 79$\pm$3,MA
OGLE003833.35-731510.1 0.177 16.467 0.019 0.084 0.064 164$\pm$3
OGLE003927.34-733309.6 0.322 15.855 -0.158 0.057 0.055 $\sim$27,ART,MA
OGLE003952.15-730057.7 0.530 18.815 -0.042 0.022 0.077 107$\pm$6,double eclipse?
OGLE004019.36-730402.9 2.172 16.207 -0.033 0.146 0.059 200$\pm$22,VA
OGLE004024.94-734416.1 1.580 16.531 -0.018 0.040 0.010 $\sim$448
OGLE004211.38-732437.7 0.345 17.916 -0.089 0.010 0.058 74$\pm$3
OGLE004212.21-734120.0 0.017 15.921 -0.197 -0.138 0.039 46$\pm$1,alias 1.01932
OGLE004323.84-733930.1 0.636 16.341 -0.190 -0.145 0.016 62$\pm$2,alias 0.98134
OGLE004336.91-732637.7 0.097 14.178 0.181 0.331 0.031 118$\pm$7,MA
OGLE004357.18-732019.9 0.139 16.510 0.386 0.668 0.065 29$\pm$1
OGLE004454.66-732802.9 0.183 14.817 0.286 0.576 0.030 17.37$\pm$0.15,VA
OGLE004517.55-732343.6 0.044 17.513 0.306 0.222 0.094 171$\pm$15
OGLE004541.10-731219.2 0.082 17.149 0.089 0.240 0.032 182$\pm$18
OGLE004541.80-724932.3 0.046 17.252 0.308 0.480 0.206 85$\pm$3
OGLE004554.14-731404.3 0.781 15.483 0.517 0.709 0.010 99$\pm$4,LA
OGLE004633.06-731919.1 0.129 17.150 -0.012 0.181 0.021 38$\pm$1,ART
OGLE004633.76-731204.3 0.092 14.058 0.206 0.385 0.057 184$\pm$18,eclipsing
OGLE004652.03-731423.7 0.084 15.995 -0.069 0.087 0.021 $\sim$567,other 67?
OGLE004653.24-724300.0 0.495 19.469 0.030 0.120 0.166 66$\pm$3
OGLE004702.75-730618.3 0.126 16.570 0.122 0.243 0.016 17.3$\pm$0.15,ART,eclipsing
OGLE004723.53-730347.0 0.110 16.328 -0.043 0.162 0.016 101$\pm$2,ART,eclipsing
OGLE004748.20-731906.1 0.073 18.355 0.194 0.392 0.079 177$\pm$10
OGLE004750.14-731316.4 0.222 15.475 0.269 0.471 0.009 30.0$\pm$0.3,LA
OGLE004816.01-730635.7 0.212 15.917 0.123 0.338 0.040 26.45$\pm$0.20,strange phase curve, also Type-1?
OGLE004833.67-732955.6 0.221 19.403 0.129 0.417 0.140 161$\pm$12
OGLE004843.23-731415.8 0.111 16.736 -0.081 0.066 0.062 $\sim$357,VA
OGLE004849.06-724309.2 0.088 17.588 0.446 0.639 0.108 150$\pm$15,rather time scale
OGLE004921.41-725844.9 3.839 14.614 0.320 0.504 0.020 197$\pm$20
OGLE004940.01-732128.8 0.078 15.891 -0.008 0.110 0.032 58$\pm$2,alias 0.98312
OGLE004942.46-730649.5 0.241 17.396 0.001 0.042 0.027 66$\pm$2,MA,including 0.98236
OGLE005011.61-730504.3 0.060 16.844 -0.032 0.180 0.091 242$\pm$30
OGLE005014.47-724428.6 0.480 16.438 -0.076 0.126 0.023 70$\pm$3,alias,0.98313
OGLE005019.83-730737.1 0.249 17.967 0.169 0.373 0.033 180$\pm$15
OGLE005020.11-724313.3 0.113 17.812 0.026 0.178 0.097 124$\pm$8
OGLE005025.64-725807.1 0.403 14.011 0.291 0.451 0.014 27.32$\pm$0.40
OGLE005043.44-732705.3 0.096 13.650 -0.192 0.013 0.039 62$\pm$2
OGLE005049.20-731356.1 0.070 16.122 -0.041 0.067 0.025 117$\pm$7,ART,alias 1.00574
OGLE005058.52-725656.6 0.041 15.604 -0.007 0.180 0.056 $\sim$617,VA
OGLE005100.18-725303.9 0.131 13.609 -0.028 0.194 0.026 63$\pm$3,ART,VA,MA
OGLE005107.59-732636.6 0.782 15.046 0.015 -0.027 0.016 185$\pm$17,LA
OGLE005117.44-725920.8 0.018 16.315 -0.028 0.159 0.062 264$\pm$40
OGLE005150.78-724521.9 0.148 15.501 -0.001 0.200 0.024 54$\pm$1,MA,including 1.015995
OGLE005201.48-732024.9 0.026 17.821 0.324 0.670 0.129 146$\pm$15,MA
OGLE005206.92-723400.4 0.163 17.130 -0.232 0.118 0.081 40$\pm$1,alias 0.97269
OGLE005214.98-730858.1 1.022 17.763 -0.068 0.030 0.036 $\sim$720,alias 1.00146
OGLE005215.23-725629.4 0.197 16.286 -0.063 0.083 0.031 $\sim$529,alias 1.01997,additionallong-term trend
OGLE005222.57-730326.6 0.512 18.967 0.506 0.699 0.060 69$\pm$2,ART
OGLE005259.82-730154.1 0.087 16.381 -0.023 0.100 0.045 171$\pm$6
OGLE005348.44-730755.2 0.081 17.996 0.108 0.229 0.084 149$\pm$5
OGLE005352.68-731839.3 0.002 16.287 0.420 0.775 0.016 112$\pm$3,strange phase curve
OGLE005356.05-731252.7 0.027 15.916 -0.083 0.179 0.026 72$\pm$3,ART,alias 1.01142
OGLE005359.22-723508.9 0.124 14.400 0.115 0.326 0.023 73$\pm$3
OGLE005411.38-731039.6 0.237 16.165 -0.065 0.109 0.019 89$\pm$2,ART,alias 1.01142
OGLE005419.85-723952.1 0.055 16.372 -0.153 0.008 0.040 124$\pm$8,ART,VA
OGLE005442.38-723521.0 0.020 16.626 -0.132 -0.107 0.076 182$\pm$7,alias 61 or 1.00692
OGLE005513.72-731245.9 0.190 15.434 -0.092 0.079 0.036 67$\pm$2 or 1.012355
OGLE005520.27-723710.1 0.035 14.876 0.190 0.295 0.041 107$\pm$3
OGLE005536.43-731301.9 0.241 17.745 0.079 0.268 0.043 176$\pm$17
OGLE005553.95-730516.3 0.159 17.788 0.011 0.179 0.069 119$\pm$8
OGLE005606.93-730002.5 0.231 16.065 -0.026 0.122 0.063 191$\pm$20
OGLE005702.18-722555.1 0.048 15.838 -0.051 0.134 0.021 $\sim$290,VA,alias 0.99667
OGLE005733.81-731706.5 0.016 17.461 0.356 0.542 0.197 $\sim$50,ChP?
OGLE005745.18-723652.1 0.041 17.518 0.474 0.551 0.173 96$\pm$10,MA,ChP?
OGLE005745.25-723532.1 0.337 13.823 -0.146 -0.148 0.011 26.20$\pm$1,or 13.12$\pm$0.3,ART
OGLE005812.58-723048.5 0.054 14.897 0.061 0.263 0.017 60$\pm$2,ART,periodic outbursts?
OGLE005822.04-722426.5 0.052 15.105 0.038 0.254 0.021 31$\pm$1,ART
OGLE010000.78-725522.9 0.023 14.435 0.045 0.243 0.033 35$\pm$3,ART
OGLE010114.84-724755.9 0.111 15.226 -0.098 0.050 0.036 31$\pm$1,ART,MA
OGLE010325.11-723915.1 0.032 16.672 0.272 0.429 0.078 83$\pm$3,alias,68
OGLE010451.21-724646.9 0.324 13.419 -0.042 0.132 0.016 44$\pm$3
OGLE010452.99-715918.8 0.128 14.224 -0.165 -0.072 0.026 44$\pm$3
OGLE010528.60-722547.0 0.257 15.610 0.217 0.418 0.063 64$\pm$3,eclipsing
OGLE010535.01-724727.5 0.153 17.112 -0.035 0.041 0.046 126$\pm$8
OGLE010619.77-721338.9 0.040 17.484 0.265 0.587 0.177 84$\pm$5,MA
OGLE010844.31-723704.1 0.061 16.948 0.401 0.516 0.235 90$\pm$5,alias 72
OGLE010902.25-723710.1 0.086 16.224 -0.028 -0.067 0.030 60$\pm$1,ART,eclipse-like events


   
Table 6: Type-4 stars.

Star
$\Delta\Phi$ V B-V V-I rms

OGLE003618.14-734624.6

0.086 14.929 0.353 0.779 0.279
OGLE003618.15-734247.4 1.419 16.177 -0.131 -0.001 0.036
OGLE003619.44-732553.1 0.132 19.519 0.258 0.516 0.182
OGLE003621.53-732610.6 0.050 14.741 0.067 0.214 0.124
OGLE003623.02-734651.0 0.016 19.551 0.484 0.531 0.304
OGLE003645.28-733259.7 1.863 15.590 -0.024 0.200 0.015
OGLE003652.74-732857.9 3.222 14.397 0.081 0.177 0.016
OGLE003715.60-734546.0 1.804 16.090 0.453 0.647 0.013
OGLE003726.27-731420.0 0.511 19.630 0.318 0.559 0.250
OGLE003730.99-731112.4 1.965 15.846 0.109 0.209 0.010
OGLE003744.41-730447.6 0.109 16.996 -0.087 -0.051 0.028
OGLE003804.71-735150.5 0.329 19.434 0.009 0.092 0.065
OGLE003810.16-730138.4 1.220 17.296 0.590 0.767 0.020
OGLE003813.77-731340.0 0.208 17.335 -0.081 0.116 0.016
OGLE003817.01-734852.6 0.025 15.199 0.462 0.709 0.280
OGLE003827.69-733314.5 1.499 16.126 -0.156 0.124 0.021
OGLE003833.29-732629.4 1.317 16.725 0.414 0.619 0.011
OGLE003836.25-734813.4 0.303 15.383 -0.140 -0.082 0.022
OGLE003837.66-731158.3 0.093 14.894 -0.085 0.057 0.028
OGLE003859.60-732525.2 0.385 15.405 -0.121 0.090 0.023
OGLE003904.81-735021.5 0.108 15.891 -0.151 -0.088 0.015
OGLE003907.18-732059.3 0.232 15.567 0.365 0.549 0.006
OGLE003915.99-734111.2 0.701 14.126 0.016 0.164 0.010
OGLE003917.62-733806.6 0.948 16.748 -0.083 0.023 0.036
OGLE003922.07-732531.6 0.170 16.942 0.106 -0.234 0.026
OGLE003940.84-732601.1 0.199 15.268 -0.056 0.111 0.035
OGLE004001.52-734112.6 0.296 17.708 -0.163 -0.139 0.064
OGLE004003.31-733722.5 0.379 16.013 -0.118 -0.147 0.022
OGLE004005.89-730410.7 1.746 15.755 0.110 0.304 0.021
OGLE004008.41-733710.1 0.675 17.375 -0.124 -0.103 0.028
OGLE004028.10-733233.0 0.055 14.992 0.027 0.230 0.013
OGLE004043.55-732059.1 1.568 18.542 0.530 0.761 0.027
OGLE004043.88-732422.9 0.069 15.275 -0.046 0.138 0.019
OGLE004044.77-732307.5 0.110 16.925 -0.158 -0.017 0.031
OGLE004049.32-732522.9 0.238 17.696 -0.151 -0.082 0.062
OGLE004101.34-734006.9 0.102 16.453 -0.018 0.203 0.014
OGLE004109.12-730646.7 0.126 17.769 -0.063 0.044 0.030
OGLE004111.34-734118.3 0.515 16.708 -0.056 0.112 0.009
OGLE004140.28-734424.6 1.224 17.818 -0.118 -0.090 0.015
OGLE004141.80-734129.3 0.886 16.294 -0.034 -0.182 0.012
OGLE004144.34-733957.1 0.711 17.609 0.584 0.769 0.015
OGLE004154.09-730916.3 0.177 17.784 -0.094 0.080 0.019
OGLE004157.28-734133.3 0.486 17.430 -0.116 0.013 0.017
OGLE004207.95-733653.7 1.128 16.162 -0.133 -0.158 0.014
OGLE004209.92-731356.2 0.234 14.732 -0.185 -0.226 0.016
OGLE004212.32-732312.1 0.010 15.272 -0.072 0.102 0.025
OGLE004214.49-731644.4 0.724 19.401 0.249 0.418 0.152
OGLE004218.06-731809.5 0.259 16.616 -0.004 0.229 0.012
OGLE004218.81-732708.4 0.033 16.045 -0.143 -0.024 0.094
OGLE004221.87-732417.1 0.038 16.158 0.402 0.669 0.056
OGLE004222.70-732335.8 2.067 19.548 0.355 0.607 0.034
OGLE004222.72-732627.9 0.212 18.761 -0.123 -0.097 0.052
OGLE004224.08-730543.4 0.437 16.546 0.555 0.723 0.017
OGLE004224.64-731658.7 0.166 15.880 -0.078 0.127 0.021
OGLE004237.76-725918.3 0.120 16.465 0.034 -0.039 0.054
OGLE004241.20-732910.9 0.030 16.228 -0.038 0.174 0.025
OGLE004244.55-732610.1 0.669 15.759 -0.175 -0.141 0.017
OGLE004245.62-724628.0 0.589 19.663 -0.097 0.026 0.177
OGLE004245.90-733026.6 0.232 17.794 -0.085 0.042 0.022
OGLE004310.22-733430.7 0.032 15.650 -0.090 0.159 0.035
OGLE004323.41-732731.8 0.116 16.231 -0.038 0.140 0.015
OGLE004326.75-730709.8 1.043 19.566 0.127 0.201 0.052
OGLE004327.84-732432.4 0.053 15.807 -0.064 0.087 0.020
OGLE004329.13-732216.4 3.723 19.081 -0.055 -0.024 0.036
OGLE004335.78-732737.3 0.034 15.586 -0.044 0.190 0.015
OGLE004336.13-731032.0 0.088 16.037 0.045 0.348 0.019
OGLE004339.05-732217.8 0.070 14.981 0.026 0.239 0.010
OGLE004349.56-733906.3 0.076 16.431 -0.128 0.048 0.038
OGLE004350.54-733141.2 0.390 19.690 0.508 0.604 0.259
OGLE004354.74-725803.3 1.156 19.615 0.153 0.163 0.084
OGLE004355.02-732725.6 0.230 16.007 -0.079 0.086 0.058
OGLE004357.34-732419.1 0.257 15.796 -0.115 -0.101 0.017
OGLE004404.12-731105.7 0.024 16.961 0.048 -0.225 0.034
OGLE004417.11-733225.0 1.462 16.540 0.449 0.661 0.010
OGLE004419.56-731659.3 0.449 16.813 0.057 0.239 0.014
OGLE004420.14-732913.8 1.467 16.474 -0.007 0.232 0.012
OGLE004433.70-732215.9 0.080 16.465 0.039 0.290 0.015
OGLE004441.11-731256.1 0.076 16.553 -0.037 0.168 0.022
OGLE004443.16-733128.8 0.438 17.637 0.013 0.004 0.050
OGLE004454.05-732323.1 0.099 17.572 0.026 0.246 0.030
OGLE004456.28-732256.2 0.183 14.660 0.036 0.305 0.027
OGLE004456.96-731938.0 0.059 16.318 0.096 0.357 0.025
OGLE004457.11-730046.6 0.075 14.379 -0.041 0.250 0.037
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Copyright ESO 2002