Table 3
Census of low-mass (spectral types mid M or later) members of the σ Orionis cluster that show strong and irregular variability.
| Name | SpT | J a | W1–W2 | acc. | IR excess | Amplitude range | References |
| (mag) | (mag) | (mag) | (mag) | ||||
| V2737 Ori | M4 | 14.46/14.54/14.36 | 0.55 | yes | yes | 0.7–1.2 | a (SE2004 33), b, c, d |
| V2721 Ori | M4 | 14.92/15.02/14.82 | 0.52 | yes | yes | 0.2–0.7 | a (SE2004 2), b, c |
| V2739 Ori | M5 | 14.92/15.13/15.01 | 0.52 | yes | yes | 0.4–0.5 | a (SE2004 43), c |
| V2728 Ori | M6 | 14.89/14.79/14.88 | 0.59 | yes | yes | 0.2–0.7 | d, e, f, g |
| Mayrit 1129222 | ... | 14.18/14.08/14.52 | 0.65 | ? | yes | 2.0 | d, h |
| Mayrit 358154 | M5 | 15.29/15.34/15.62 | 0.73 | yes | yes | 0.9 | d, h |
| Mayrit 264077 | M3 | 14.74/14.46/14.45 | 0.78 | yes | yes | 0.9 | h |
| Mayrit 258337 | ... | 15.07/14.81/14.80 | 0.66 | yes | yes | 0.5 | d, i |
| Mayrit 396273 | ... | 15.29/15.29/15.45 | 0.31 | ? | no | 0.25 | i |
Notes.
Three magnitude values given in order of Peña Ramírez et al. (2012), UKIDSS, and 2MASS (Cutri et al. 2003).
Reference. a: Scholz & Eislöffel (2004); b: Scholz et al. (2009b); c: Bozhinova et al. (2016); d: Lodieu et al. (2009); e: Caballero et al. (2006); f: Caballero et al. (2004); g: Cody & Hillenbrand (2010); h: Cody & Hillenbrand (2010); i: this work.
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