Table 1
Basic properties of young members and photometric candidates in σ Orionis from Peña Ramírez et al. (2012) that are studied in this work.
| Resolvable Simbad ID | RA | Dec | Feat. a | IR Excess | J b | ℳ | Var? c | Comments |
| hh:mm:ss.s | dd:mm:ss | (mag) | (MJup) | |||||
|
|
||||||||
| Variability and deep image analysis | ||||||||
|
|
||||||||
| Mayrit 258337 | 05:38:38.1 | –02:32:03 | RV, g, d | Y(4.5, 8.0, 12.0) | 15.07 | 56 | Y | SB1, Known var. |
| Mayrit 396273 | 05:38:18.3 | –02:35:39 | RV, g | N | 15.29 | 47 | Y | |
| Mayrit 379292 | 05:38:21.4 | –02:33:36 | RV, Li, g, d | Y(12.0) | 15.31 | 47 | ... | |
| [MJO2008] J053852.6–023215 | 05:38:52.6 | –02:32:15 | RV, g | N | 16.18 | 29 | ... | |
| [BNM2013] 90.02 782 | 05:39:12.9 | –02:24:54 | Hα | N | 16.68 | 24 | ... | |
| [BNM2013] 90.02 1834 | 05:39:00.3 | –02:37:06 | Hα, d | Y(4.5, 8.0) | 17.19 | 19 | ... | |
| [BZR99] S Ori 51 | 05:39:03.2 | –02:30:20 | g | N | 17.16 | 19 | ... | |
| [BZR99] S Ori 50 | 05:39:10.8 | –02:37:15 | ... | N | 17.47 | 17 | ... | Photometric cand. |
| [BZR99] S Ori 58 | 05:39:03.6 | –02:25:36 | Hα, d | Y(4.5, 8.0) | 18.42 | 11 | ... | |
|
|
||||||||
| Deep image analysis only | ||||||||
|
|
||||||||
| [BZR99] S Ori 60 | 05:39:37.5 | –02:30:42 | Hα, d | Y(8.0) | 19.02 | 8 | ... | |
| [BZR99] S Ori 62 | 05:39:42.1 | –02:30:32 | Hα | N | 19.14 | 8 | ... | |
| [BZR99] S Ori 65 | 05:38:26.1 | –02:23:05 | d | Y(4.5, 8.0) | 20.30 | 5 | ... | |
Notes.
RV: radial velocity consistent with systemic cluster velocity, g: low-gravity atmosphere, Li: lithium absorption, Hα: strong, broad Hα emission, d: presence of a disc.
J-band magnitude from Peña Ramírez et al. (2012).
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