Table 2
Main parameters of the observed targets.
| a | b | c | d | e | f | g | h | i | j | k | l | m |
| Name | d | V | T eff | log(g) | BC | log(Lbol) | CR | f X,1 | f X,2 | L X,1 | L X,2 | log( ) |
| - | (pc) | (mag) | (kK) | (cm s-2) | (mag) | (L⊙) | (× 10-3c s-1) | (× 10-14 erg cm-2 s-1) | (× 1029 erg s-1) | |||
|
|
||||||||||||
| BD+75° 325 | 136 (3) |
9.55 (4) | 55 (9) | 5.5 (9) | –4.76 | 2.21 | <1.6 | <2.7 | <1.2 | <0.6 | <0.3 | <–7.05 |
| BD+25° 4655∗ | 110 (3) |
9.69 (2) | 41.7 (2) | 6.7 (2) | –3.94 | 1.64 | <2.2 | <3.6 | <1.7 | <0.5 | <0.2 | <–6.53 |
| BD–22° 3804 | 185 (3) |
10.03 (2) | 42.5 (10) | 5.25 (10) | –4.00 | 1.98 | <1.5 | <2.4 | <1.1 | <0.9 | <0.4 | <–6.59 |
| BD+37° 1977∗ | 2600 (1) | 10.15 (19) | 48 (1) | 4 (1) | –4.36 | 4.37 | 3.6 |
5.9 |
2.7 |
450 |
210 |
–6.30 ± 0.12 |
| BD+39° 3226 | 235 (3) |
10.18 (2) | 45 ± 5 (11) | 5.5 ± 0.5 (11) | –4.15 | 2.19 | <1.4 | <2.4 | <1.1 | <1.5 | <0.7 | <–6.60 |
| BD–03° 2179 | 631-318 (3) | 10.33 (2) | 62 ± 5 (5) | 4.5 ± 0.5 (5) | –5.12 | 3.38 | <3.2 | <5.2 | <2.4 | <23 | <11 | <–6.59 |
| BD+28° 4211 | 92 (3) |
10.51 (4) | 82 ± 5 (12) | 6.2 (12) |
–5.95 | 1.96 | 1.8 |
2.9 |
1.3 |
0.3 ± 0.1 | 0.13 |
–7.10 |
| CD–31 4800 | 132 (3) |
10.52 (2) | 44 ± 1 (10) | 5.4 ± 0.3 (10) | –4.10 | 1.53 | <1.5 | <2.5 | <1.2 | <0.5 | <0.2 | <–6.42 |
| BD+48° 1777∗ | 163 (3) |
10.74 (5) | 40 (5) | – | –3.82 | 1.52 | <2.3 | <3.8 | <1.7 | <1.1 | <0.5 | <–6.04 |
| LS V +22 38∗ | 180∗ | 10.93 (6) | 40 (12) | – | –3.82 | 1.53 | <2.3 | <3.8 | <1.7 | <1.4 | <0.6 | <–5.96 |
| LS IV –12 1 | 400 ± 150 (7) | 11.16 (2) | 60 (2) | 4.5 (2) | –5.02 | 2.61 | <1.4 | <2.4 | <1.1 | <4.3 | <2.0 | <–6.56 |
| Feige 34∗ | 325 (3) |
11.18 (4) | 70 ± 10 (5) | 7.3 ± 0.4 (5) | –5.48 | 2.60 | 4.6 |
7.5 |
3.4 |
17.0 |
7.8 |
–6.23 |
| LSE 153 | 250 ± 100 (7) | 11.36 (2) | 70.0 ± 1.5 (2) | 4.75 ± 0.15 (2) | –5.48 | 2.30 | <3.0 | <5.0 | <2.3 | <3.6 | <1.6 | <–6.34 |
| LSS 1275 | <1000 (8) | 11.37 (2) | 75 ± 4 (2) | 5.0 ± 0.2 (2) | –5.69 | 3.59 | <10.7 | <17.5 | <8.0 | <200 | <90 | <–5.87 |
| LSE 263 | 250 ± 100 (7) | 11.55 (19) | 70.0 ± 2.5 (2) | 4.90 ± 0.25 (2) | –5.48 | 2.23 | <3.8 | <6.2 | <2.8 | <4.4 | <2.0 | <–6.17 |
| BD+18° 2647 | 275 (3) |
11.63 (19) | 75 ± 5 (10) | 5.2 ± 0.2 (10) | –5.69 | 2.36 | <2.3 | <3.8 | <1.7 | <3.2 | <1.5 | <–6.44 |
| LSE 21 | 50 (7) | 11.64 (19) | 110 ± 10 (2) | – | –6.82 | 1.33 | <1.5 | <2.4 | <1.1 | <0.07 | <0.03 | <–7.08 |
| LS IV +10 9∗ | 230 ± 100 (7) | 12.05 (2) | 45 (13) | 5.6 (13) | –4.17 | 1.43 | <1.5 | <2.4 | <1.1 | <1.4 | <0.7 | <–5.86 |
| LS I +63 198∗ | 200∗ | 12.80∗ (20) | 34 ± 7 (2) | 5.4 ± 0.3 (2) | –3.33 | 0.67 | <1.8 | <3.0 | <1.4 | <1.4 | <0.6 | <–5.13 |
|
|
||||||||||||
| HD 49798 | 650 ± 100 (14) | 8.29 (4) | 46.5 (15) | 4.35 (15) | –4.27 | 4.15 | – | 7.3 ± 0.7∗ (16) | 66 ± 1∗ (16) | 35 ± 3 | 315 ± 5 | –7.21 ± 0.05 |
| BD+37° 442 | 2000 (10) |
10.01 (17) | 48 (1) | 4.00 ± 0.25 (10) | –4.36 | 4.40 | – | – | 2.6 ± 0.3∗ (18) | – | 120 ± 14 | – |
Notes.The bibliographic reference of the reported values is given in parenthesis.
Source name (∗ sources with an infrared flux excess detected at a confidence level higher than 2σ (Thejll et al. 1995; Ulla & Thejll 1998));
apparent visual magnitude (∗ LS I +63 198 was included in our sample based on the brighter magnitude provided by Østensen (2006));
flux in the energy range 0.2–10 keV, based on the measured count rate or count-rate upper limit, assuming a power-law spectrum (∗ measured flux during source eclipse);
flux value in the energy range 0.2–10 keV, based on the measured count rate or count-rate upper limit, assuming a power-law plus blackbody spectrum (∗ measured flux, out of source eclipse for HD 49798);
Reference. 1 - Jeffery & Hamann (2010); 2 - Østensen (2006); 3 - van Leeuwen (2007); 4 - Landolt & Uomoto (2007); 5 - Thejll et al. (1995); 6 - Høog et al. (1998); 7 - Schonberner & Drilling (1984); 8 - Rauch et al. (1991); 9 - Lanz et al. (1997); 10 - Bauer & Husfeld (1995); 11 - Rodríguez-López et al. (2007); 12 - Latour et al. (2013); 13 - Ulla & Thejll (1998); 14 - Kudritzki & Simon (1978); 15 - Hamann (2010); 16 - Mereghetti et al. (2013); 17 - Landolt 1973; 18 - La Palombara et al. (2012); 19 - Høg et al. (2000); 20 - Reed (2003)
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