Table 1
Physical parameters of the sample stars.
| Star | ST | d | T eff |
|
log g | R | Vsin i | v mac | C/H | N/H | Ṁ | v ∞ | β | f | |||
| [pc] | [kK] | [R⊙] | [km s-1] | [km s-1] | [10-4] | [10-5] | [M⊙ yr-1] | [km s-1] | |||||||||
|
|
|||||||||||||||||
| ϵ Ori | B0Iab | 410±150 | 27.5±1.0 | 5.60±0.33 | 3.10 | 28.0±16.0 | 40 | 38 | 1.4±1.0 | 10.3±6.8 | −6.25 | 1800 | 1.2 | 0.05 | |||
| HD 167264 | B0.5Ia/Iab | 1700±510 | 28.0±1.0 | 5.65±0.27 | 3.10 | 28.6±12.5 | 70 | 22 | 1.2±0.5 | 18.0±8.0 | −6.50 | 2000 | 1.8 | 0.1 | |||
| HD 207198 | O9II | 620±180 | 32.5±1.0 | 5.05±0.26 | 3.50 | 10.6±4.4 | 60 | 27 | 1.6±0.8 | 20.0±6.0 | −7.0 | 2000 | 3.0 | 1.0 | |||
| HD 188209 | O9.5Ib | 2000±600 | 29.8±1.0 | 5.65±0.26 | 3.20 | 25.2±10.5 | 45 | 33 | 0.7±0.5 | 35.0±18.0 | −6.4 | 2000 | 2.2 | 0.05 | |||
| HD 209975 | O9Ib | – | 30.5±1.0 | 5.35±0.30 | 3.35 | 17.0±8.2 | 48 | 40 | 1.2±0.9 | 20.5±11.4 | −6.50 | 2000 | 2.9 | 1.0 | |||
| HD 34078 | O9.5V | 445±145 | 34.0±1.0 | 4.65±0.29 | 4.10 | 5.4±2.6 | 25 | 5 | 2.5±1.5 | 7.0±1.1 | −10.0 | 1000 | 1.0a | 1.0a | |||
| 10 Lac | O9V | 325±65 | 35.0±1.0 | 4.35±0.18 | 4.05 | 4.1±1.1 | 15 | 15 | 2.3±1.0 | 17.6±3.9 | −9.70 | 1200 | 1.0a | 1.0a | |||
Notes. Distances are from Hipparcos catalogue (Perryman et al. 1997) when the uncertainty on the parallax is lower than 30%. For the remaining objects, the distances provided by Mason et al. (1998) where used, with a conservative uncertainty of 30 per cent. The luminosity of HD 209975 is adopted (HD 209975 being a Ib supergiant, we chose a value intermediate between a O9III and a O9I according to Martins et al. 2005). This corresponds to a distance of 1350 pc. The Hipparcos distance (630±190 pc) implies a very low value ( = 4.7) for a late O supergiant. (a) Adopted.
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