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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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