Table 3.
Information about bright stars and their companions in Orion.
| HD | Name | V | Spectral | AV | V0 | MV | V0 − MV | Gaia DR3 parallax | Notes |
|---|---|---|---|---|---|---|---|---|---|
| [mag] | type | [mag] | [mag] | [mas] | |||||
| 36486 | δ Ori | 2.22 ( * ) | O9.5 II | 0.13 | 2.09 | −5.81 | 7.90 | OB1b association, multiple | |
| 37128 | ε Ori | 1.68 ( * ) | B0 Ia | 0.14 | 1.54 | −6.25 ( * *) | 7.79 | OB1b, single, variable 0.05 mag | |
| 37742 | ζ Ori | 1.75 ( * ) | O9.5 Ib | 0.17 | 1.58 | −6.28 ( * *) | 7.92 | OB1b, multiple | |
| 37468 | σ Ori | 3.82 ( * ) | O9.5 V | 0.17 | 3.65 | −4.14 | 7.79 | OB1b, multiple | |
| 37043 | ι Ori | 2.75 | O8.5 III | 0.09 | 2.66 | −5.13 | 7.79 | OB1d (Trapezium), multiple | |
| 36486 Aa1 | δ Ori Aa1 | 2.55 | O9.5 II | 2.42 | −5.7 ( * *) | 8.12 | cf. this work | ||
| 36486 Aa2 | δ Ori Aa2 | 5.5? | B2 V | 5.4? | −2.5? | 0.00052″ from Aa1, Shenar et al. (2015) | |||
| 36486 Ab | δ Ori Ab | 3.83 | B0 IV | 3.70 | −4.0 ( * * * ) | 7.70 | 0.32″ | ||
| 36486 B | δ Ori B | 14.0 | K? | 13.9 | +6.6 | 3.5002 ± 0.0119 | 33″, UCAC3 180-24383 | ||
| 36485 Ca | δ Ori Ca | 6.62 | B3 V | 6.49 | −1.6 ( * * * ) | 8.09 | 2.6244 ± 0.0538 | 52″, helium star, Leone et al. (2010) | |
| 36485 Cb | δ Ori Cb | 9.8? | A0 V | 9.7? | +1.8? | 0.0012″ from Ca | |||
| 37742 Aa | ζ Ori Aa | 2.1 | O9.5 Ib | Hummel et al. (2000) | |||||
| 37742 Ab | ζ Ori Ab | 4.3 | B0.5 IV | 0.042″ | |||||
| 37743 | ζ Ori B | 4.0 | B0 III | 2.4″ | |||||
| 37742 C | ζ Ori C | 9.54 | A? | 2.5876 ± 0.0387 | 57″ | ||||
| 37468 Aa | σ Ori Aa | 4.61 | O9.5 V | Simón-Díaz et al. (2015) | |||||
| 37468 Ab | σ Ori Ab | 5.20 | B0.5 V | 0.00042″ | |||||
| 37468 B | σ Ori B | 5.31 | B? | 0.25″ | |||||
| 37468 C | σ Ori C | 8.79 | B0.5 V | 2.4720 ± 0.0292 | 11″ | ||||
| 37468 D | σ Ori D | 6.62 | B2 V | 2.4744 ± 0.0621 | 13″ | ||||
| 37468 E | σ Ori E | 6.66 | B2 V | 2.3077 ± 0.0646 | 42″, helium star | ||||
| 37043 Aa1 | ι Ori Aa1 | 2.8? | O8.5 III | Bagnuolo et al. (2001) | |||||
| 37043 Aa2 | ι Ori Aa2 | B0.8 III | 0.0015″, eccentric | ||||||
| 37043 Ab | ι Ori Ab | B2 IV | 0.15″ | ||||||
| 37043 B | ι Ori B | 7.00 | B8 III | 2.7869 ± 0.0476 | 11″ | ||||
| 37043 C | ι Ori C | 9.76 | A0 V | 2.6057 ± 0.0241 | 49″, Parenago (1954), Brun 731 | ||||
Notes. ( * )Hvar all-sky photometry; ( * *)Martins et al. (2005); ( * * * )Schmidt-Kaler (1982); spectral types from Maíz Apellániz et al. (2019), Burssens et al. (2020) and absorption from Lallement et al. (2019). The visual magnitude including absorption is denoted by V; the absorption, by AV; the visual magnitude without absorption, by V0; and the distance modulus computed from visual magnitude, by MV.
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