Issue 
A&A
Volume 570, October 2014



Article Number  A100  
Number of page(s)  20  
Section  Stellar structure and evolution  
DOI  https://doi.org/10.1051/00046361/201424522  
Published online  03 November 2014 
Online material
Appendix A: Frequency content of the new CoRoT RR Lyrae star: 0101315488
Frequency table of the newly discovered CoRoT RRab star, 488.
Table A.1 contains the frequencies that we found during the frequency analysis. The star pulsates with a period of 0.485299 days. The following epoch for maxima was found: (A.1)Digits in parentheses denote the uncertainties. Nine harmonics can be found in the frequency spectrum. No additional frequencies were found.
Appendix B: Frequency table of the new CoRoT RRab star: 0103800818
Frequency table of the unmodulated CoRoT RRab star, 818.
Table B.1 enumerates the frequencies of the unmodulated RR Lyrae, 818. The period of this star is 0.4659348 days. No modulation was found in this RRab star. We found the following epoch for maxima: (B.1)After prewhitening, “forests” of peaks remain around the harmonics. These do not show any obvious modulation pattern, so we decided not to list them in Table B.1.
Appendix C: Frequency table of the new CoRoT RR Lyrae star: 0104315f804
In Table C.1 we give the frequency content of 804. The star pulsates with a period of 0.7218221 days. No signs of modulation or additional frequencies were found in this object. The following epoch for maxima was obtained: (C.1)
Frequency table of the nonmodulated CoRoT RRab star, 804.
Appendix D: Frequencies of 0100881648
In Table. D.1 we present the result of the Fourier analysis of the blended CoRoT Blazhko RRab star, 648. The following epoch for maxima was found: (D.1)
Frequency table of the blended Blazhko RRab star, 648.
This is a heavily blended Blazhko RRab star. The spectrum shows the frequency corresponding to the fundamental mode pulsation (f_{0}) and nine harmonics. In addition, the right components of the modulation triplets are seen prominently around the harmonics after prewhitening. In a few cases, the left hand side peaks are also detected. The remaining spectrum consists of the known orbital frequencies of CoRoT, their linear combinations with the sideral day, many peaks due to lowfrequency variations in the frequency interval 0.1−0.7 d^{1}, and some residuals around the main frequency and around the loworder harmonics. The residual peaks are at the level of 73 μmag. The amplitude and frequency variation of the star due to the Blazhkomodulation was already presented in Szabó et al. (2009).
Appendix E: Frequencies of the blended Blazhko RRab star 0101370544
Table E.1 lists the result of the Fourier analysis of the second blended CoRoT Blazhko RRab star, 544. This object was observed in the color mode of CoRoT, but we chose to present the coadded (white) light frequencies, because this data set is superior to the individual color observations. The following epoch for maxima was found: (E.1)
Frequency table of the white band light curve of the blended Blazhko RRab star, 544.
Despite the heavy blending, the spectrum shows the frequency corresponding to the fundamental mode pulsation (f_{0}), and ten harmonics. In addition, the triplet components of the modulation found around f_{0} are revealed around most of the harmonics after prewhitening. The right sidelobes (k ∗ f_{0} + f_{m}) are present with higher amplitudes than their left hand counterparts. The remaining spectrum consists of the known orbital frequencies of CoRoT, and their linear combinations with the sideral day, many peaks due to lowfrequency variations in the frequency interval 0.2−0.8 d^{1}, some residuals around the main frequency and loworder harmonics, and a few remaining peaks close to or below the significance level between f_{0} and 2f_{0}. The residual peaks are at the level of 28 μmag. The amplitude and frequency variation due to the Blazhkomodulation was presented in Szabó et al. (2009).
Appendix F: Frequencies of the CoRoT RRc star 0105036241
Frequency table of the CoRoT RRc star, 241.
Besides the dominant first overtone frequency (f_{1} = 2.68153 d^{1}) and its harmonics, we see f′ in the spectrum with a characteristic 0.613 frequency ratio with the firstovertone
radial pulsation (Table F.1). In addition, several frequencies were found in the [0.5; 1.5] d^{1} frequency range. Upon inspecting the data, we found that their origin can be traced back to two remaining discontinuities, therefore these portions of the data set CJD [3046.0−3048.0] and [3156.5−3157.5] were removed. In the following we analyze the remaining data set.
We found high lefthand side peaks around the main frequency and its harmonics. If we suppose that f_{m} = 0.00585 d^{1} is a modulation frequency, the period of the modulation would be longer than the data set. According to that this star may show a longperiod Blazhkomodulation, but more data would be needed to confirm this finding. Another set of modulationlike frequency difference appears in the data set (Fig. 13, Table F.1). We denote the corresponding frequency f_{b}. Neither f_{m}, nor f_{b} can be found in the frequency spectrum, but they only appear through combination frequencies. Even combination frequencies involving both f_{m} and f_{b} can be identified. We note here that as we demonstrated in Sect. 4.3, f′ has temporal amplitude variation, and this is the most probable culprit causing the appearance of the f_{b} modulation frequencies. The strongest argument favoring this scenario is that f_{b} appears only close to and in combination with f′, and is not seen around the main pulsation frequency, f_{1}. In addition, frequencies associated with the orbital period of the satellite and its daily aliases are seen at f = 13.967924,14.974027,12.969585 d^{1} as usual in CoRoT data. We omitted these peaks from Table F.1. The following epoch for maxima was found: (F.1)or taking a gradual period change into account: (F.2)
Appendix G: Frequencies of the CoRoT RRc star 0105735652
We detect the main frequency f_{1} = 3.58218 d^{1} and its harmonics, but also many other frequencies with lower amplitude. Among them we found a highly significant frequency at f′ = 5.82484 d^{1} with several peaks around it, then additional peaks around f_{1}. The frequencies are available in Table G.1. The following epoch for maxima and period were found: (G.1)After prewhitening with the frequencies enumerated in Table G.1, a dense forest of frequencies remains around f_{1}. We also see similar residual power around the second and third harmonics, frequencies around 5.9,9.4,16.5,20.1 d^{1}, and frequencies related to the orbital frequency of CoRoT.
The large number of side frequencies seen around frequencies f′ and 9.470874 d^{1} may be the result of their nonstationary nature (modulation). We gave an example in Szabó et al. (2010) where the frequency forest found around the the halfinteger frequencies was modeled and explained by the varying amplitude of these frequencies. We see a very similar situation here.
Frequency table of the CoRoT RRc star, 652.
© ESO, 2014
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