Table A.1
Optical/IR parameters of CPM companions to UCDs and UCD candidates that have a proper-motion corrected position at the mean eRASS 1 observing date within 3 × the positional error of an eRASS1 source.
| Gaia DR2 designation of UCD | Gaia DR2designation of companion | Other name of companion | sepUC [″] | G (mag) | J (mag) | W1 (mag) | SpType | fx,Band 2 (erg cm−2s−1) | Youth flag | Youth ref | Binary flag | Binary ref |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2999273759851225856 | 2999273759850687360 | 5.89 | 16.11 | 12.52 | 11.39 | M5.5−M6V | (4.46 ± 2.03) × 10−14 | Y | 5 | N | … | |
| 3164100487113671552 | 3164100487115775488 | BD+13 1727 | 11.02 | 9.44 | 8.04 | 7.92 | K2−K2.5V | (5.97 ± 2.67) × 10−14 | N | … | Y | 2 |
| 3181197137010596608 (*) | 3181197137010596480 (*) | WDSJ04469−1117AB | 1.52 | 12.22 | 8.14 | 7.84 | M7V | (123.36 ± 13.22) × 10−14 | N | … | Y | 3,4 |
| 3777108250009273856 | 3777111239307270528 | BD−03 3000 | 20.68 | 9.58 | 8.25 | 7.93 | K1.5−K2V | (6.07± 2.87) × 10−14 | N | … | Y | 1,10 |
| 4709450095539630080 | 4709450095539630208 | 6.42 | 14.63 | 11.47 | 10.23 | M4−M4.5V | (4.59 ± 1.62) × 10−14 | N | … | Y | 10,11,12 | |
| 5013728217560115328 | 5013728221855947264 | 9.05 | 14.0 | 11.45 | 10.49 | M2−M2.5V | (2.73 ± 1.15) × 10−14 | N | … | Y | 11,12 | |
| 5541067154025506048 | 5541067158327484288 | CD−37 4268 | 19.34 | 9.77 | 8.76 | 8.37 | G1−G2V | (5.54 ± 1.94) × 10−14 | N | … | N | … |
| 5762038930728469888 | 5762038930729097728 | UCAC4 434−049409 | 8.84 | 10.89 | 8.63 | 7.98 | M0−M0.5V | (9.21 ± 2.98) × 10−14 | N | … | Y | 10,12 |
| 5774202926652248832 | 5774202930948040064 | 6.74 | 16.08 | 12.86 | 11.76 | M4−M4.5V | (2.41 ± 1.10) × 10−14 | Y | 7 | N | … | |
| 5810656757928226560 | 5810656753637344384 | CD−68 1857 | 18.18 | 8.58 | 7.62 | 7.89 | G0−G1V | (3.31 ± 1.54) × 10−14 | N | … | Y | 9,10 |
| 6061624891182052224 | 6061625097356185216 | 12.72 | 14.49 | 11.41 | 10.41 | M4−M4.5V | (5.02± 1.45) × 10−14 | Y | 6,7 | N | … | |
| 6068636442466042240 | 6068636438170702848 | TYC 8662-1667−1 | 13.07 | 11.11 | 9.78 | 9.12 | K1.5−K2V | (2.71 ± 1.21) × 10−14 | N | … | Y | 12 |
| 6078707625378651264 | 6078707621090084736 | 5.68 | 15.81 | 12.55 | 11.42 | M4.5−M5V | (2.91 ± 1.14) × 10−14 | N | … | Y | 10,11 | |
| 6093120294382123648 | 6093120298678786944 | 6.21 | 14.56 | 11.59 | 10.58 | M3.5−M4V | (10.45 ± 2.54) × 10−14 | Y | 8 | N | … |
Notes. (*)This pair is a binary UCD that is not resolved with 2MASS. Spectral types are M4.9 and M6 and an age range of 60–300Myr was estimated (Shkolnik et al. 2009).
References. (1) Washington Double Star Catalog, (2) Cruz et al. (2007), (3) Shkolnik et al. (2009), (4) Shkolnik et al. (2012), (5) Zari et al. (2017), (6) Goldman et al. (2018), (7) Zari et al. (2018), (8) Damiani et al. (2019), (9) Kervella et al. (2019), (10) Hartman & Lépine (2020), (11) Sapozhnikov et al. (2020), (12) Tian et al. (2020).
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