Table 2
Properties of the H II regions ionizing stars.
| Star | Spectral type | RA, Dec (J2000) (h:m:s,°:′:″) | Offset (′,′) | Distance (pc) | HII region | Radius(⋆) (′) |
|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
| σOri | 09.5V B | 05 38 44.779, −02 36 00.12 | (−33.35, 00.07) | 387.5 ± 1.3 (1) | IC 434 | 42 |
| HD 38087 | B5V D | 05 43 00.573, −02 18 45.38 | (32.87, 01.33) | 169 ± 37 (2) | IC 435 | 3 |
| HD 37903 | B 1.5V C | 05 41 38.388, −02 15 32.48 | (13.72, 09.42) | 362 ± 35 (2) | NGC 2023 | 2.5 |
| Alnitak | O9.7Ib+B0III C | 05 40 45.527, −01 56 33.26 | (05.49, 31.04) | 294 ± 21 (4) | 11 | |
| IRS2b | 08V-B2V | 05 41 45.50, −01 54 28.7 | (20.54, 29.43) | 415 (3) | NGC 2024 | 12 |
| V(⋆) V901 Ori | B2V C | 05 40 56.370, −01 30 25.857 | (14.44, 55.99) | 437 ± 11 (5) | 3.5 | |
| HD 37674 | B5V(n) C | 05 40 13.539, −01 27 45.25 | (4.69, 55.99) | 425 ± 15 (5) | 5 |
Notes. (⋆)Radius of the circles drawn in Fig. 6. They are determined according to the size of the H II region emission either in Hα or in radio continuum (see Sect. 6).
References. (1) Schaefer et al. (2016); (2) Gaia Collaboration (2016); (3) Anthony-Twarog (1982); (4) Hummel et al. (2013); (5) Gaia Collaboration (2018).
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