Table 5
Companions of the ONC targets.
Star | Component | Sep./Period | SpT | Mass | Detection method | Comp. detect. limits | Reference/Comment |
[′′]/days | [M⊙] | AMBER | |||||
|
|||||||
θ1 Ori C | C1 | O5.5 | ~38 | ~4 M⊙ | 2, 5 | ||
2–240 mas | |||||||
C2 | 0.040′′ | ~5 | speckle interferometry | 5, this paper | |||
C3 | 0.002′′ | ~1 | spectroscopy | 11, 12 | |||
C4 | ~1.4 | spectroscopy | 10 | ||||
C5 | 28 d around C4 | ~1.3 | spectroscopy | 10 | |||
θ1 Ori A | A1 | B0.5 | ~20 | ~3 M⊙ | 6 | ||
3–280 mas | |||||||
A2 | 0.2′′ | ~4 | AO | 2, 3, 4, this paper | |||
A3 | 65 d ≈ 1.5 mas | A0 | ~4 | spectroscopy | 1, 13, 14, 15, 16 | ||
θ1 Ori D | D1 | B0.5 | ~3 M⊙ | 4 | |||
2–240 mas | |||||||
D2 | 1.401′′ | AO | 4 | ||||
D3 | 0.0184′′ | interferometry | 4, this paper | ||||
D4 | 40 d | spectroscopy | 22, this paper | ||||
θ2 Ori A | A1a | O9.5 | ~25 | ~3.5 M⊙ | 6, 7 | ||
2–140 mas | |||||||
A1b | 21 d, ≈ 1 mas | ~9 | spectroscopic | 8, 17 | |||
A2 | 0.38′′ | ~7 | AO | 7, 18 | |||
NU Ori | Aa | B1 | ~2.7 M⊙ | 6 | |||
2–150 mas | |||||||
Ab | 8–19 d ≈ 0.4−0.8 mas | ~3 | spectroscopic | 6, 8, 17 | |||
B | 0.47′′ | ~1 | AO | 9 | |||
C | ~0.015′′ | interferometry | this paper | ||||
V* T Ori | Aa | A3 | ~2.2 M⊙ | 9 | |||
2–200 mas | |||||||
Ab | 14.3 d | spectroscopy | 20, 21 | ||||
B | 0.84′′ | spectroscopy | 19 |
Notes. As the observational limits for detectable companions change with the brightness of the primary target and the used baseline configuration, in row 7 the limits for each of the observed sample stars are given. The mass is the minimum required mass of the companion as obtained from the Siess et al. (2000) models for an age of 106 yrs to be able to be clearly detected. Below the range of separations covered by the observations is given.
References. (1) Bossi et al. (1989); (2) Schertl et al. (2003); (3) Petr et al. (1998); (4) (1) Close et al. (2012); (5) Kraus et al. (2009); (6) Stelzer et al. (2005); (7) Preibisch et al. (1999); (8) Morrell & Levato (1991); (9) Köhler et al. (2006); (10) Vitrichenko et al. (2011); (11) Lehmann et al. (2010); (12) Vitrichenko et al. (2012); (13) Vitrichenko & Plachinda (2001); (14) Vitrichenko et al. (1998); (15) Lohsen (1975); (16) Lohsen (1976); (17) Abt et al. (1991); (18) Mason et al. (2009), (19) Wheelwright et al. (2010); (20) Shevchenko & Vitrichenko (1994); (21) Corporon & Lagrange (1999); (22) Vitrichenko (2002).
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