Table 1
List of massive stars observed for this programme.
| Name | Other | V | Spectral type |
| identifier | |||
|
|
|||
| HD 36879 | BD + 21 899 | 7.58 | O5 III (f) var |
| HD 47839 | 15 Mon | 4.64 | O6.5 III (n)(f) |
| CPD−28 2561 | CD−28 5104 | 10.09 | O6.5 f?p |
| CPD−47 2963 | CD−47 4551 | 8.45 | O4 III (f) |
| HD 77581 | Vela X-1 | 6.93 | B0.5 I ae* |
| HD 92206c | CD−57 3378 | 9.07 | O8.5 V p |
| HD 303225 | CD−59 3225 | 9.74 | B* |
| HD 93026 | CD−58 3518 | 9.67 | B2 III* |
| HD 93521 | BD + 38 2179 | 7.04 | O9.5 V p |
| HD 93632 | CD−59 3328 | 8.38 | O5 III (f) var |
| CPD−58 2611 | CD−58 3526 | 9.55 | O6 V ((f)) |
| HD 93843 | CD−55 5846 | 7.33 | O5 III (f) var |
| HD 130298 | CD−55 5846 | 9.29 | O6.5 III (n)(f) |
| HD 148937 | CD−47 10855 | 6.77 | O6.5 f?p |
| HD 149757 | ζ Oph | 2.58 | O9.5 V nn |
| HD 328856 | CD−46 11016 | 8.50 | O9.5 III* |
| CPD−46 8221 | CD−46 11017 | 9.19 | O +* |
| HD 150958 | CD−46 11019 | 7.29 | O6.5 Ia (n)f+ |
| HD 151804 | HR 6245 | 5.25 | O8 Iaf |
| HD 153426 | CD−38 11431 | 7.49 | O9 II-III |
| HD 153919 | CD−37 11206 | 6.53 | O6.5 Ia f+ |
| HD 154643 | CD−34 11503 | 7.15 | O9.5 III |
| HD 156041 | CD−35 11432 | 9.2 | B0 V* |
| HD 156154 | CD−35 11445 | 8.04 | O8 Iab (f) |
| HD 157857 | BD−10 4493 | 7.81 | O6.5 III (f) |
| HD 164794 | 9 Sgr | 5.93 | O4 V ((f)) |
| HD 170580 | BD + 03 3727 | 6.69 | B2 V* |
| HD 170783 | BD + 04 3778 | 7.73 | B5* |
| HD 172175 | BD−07 4642 | 9.44 | O6 I (n)f |
| HD 191612 | BD + 35 3995 | 7.84 | O8 f?p |
Notes. Spectral classifications are listed according to the Galactic O Star Catalogue (Maíz-Apellániz et al. 2004). All objects were observed with FORS 2, except HD 36879, HD 47839, and HD 191612, which were observed with SOFIN, HD 151804, which was observed with HARPS, and HD 164794, which was observed with HARPS and SOFIN.
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