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Table 2

Stellar parameters derived from quantitative analysis with atmosphere models.

Star HD 191612 Θ1 Ori C ζ Ori A HD 57682 HD 108 HD 148937 τ Sco

Spectral type O6–8f?p O7V O9.7Ib O9IV O4–8f?p O5.5–6f?p B0.2V
Teff (K) 36 000  ±  2000 38 000  ±  2000 29 500  ±  1000 34 500  ±  1000 35 000  ±  2000 40 000  ±  2000 31 000  ±  1000
log g 3.75  ±  0.10 4.20  ±  0.20 3.25  ±  0.10 4.00  ±  0.20 3.50  ±  0.10 4.00  ±  0.10 4.10  ±  0.10
log (L/L) 5.45  ±  0.15 4.80  ±  0.13 5.64  ±  0.15 4.79  ±  0.25 5.70  ±  0.10 5.80  ±  0.15 4.37  ±  0.08
R ∗  (R) 12.3  ±  1.9 5.8  ±  1.2 25.4  ±  1.7 7.0  ±  0.4 19.4  ±  2.2 16.6  ±  1.7 5.3  ±  0.6
Mev (M)
Mspec (M) 38.7  ±  20.7 19.7  ±  14.0 42.0  ±  21.2 17.8  ±  14.02 43.3  ±  18.7 101.0  ±  53.1 13.1  ±  4.5
V sin i (km s-1)  <1 24 100 15  <1  <50 6
vmac (km s-1) 40 30  ~0 16 45 60 3
N/H (number) (2.7  ±  1.5)  ×  10-4 (5.1  ±  4.5)  ×  10-5 (3.3  ±  1.0)  ×  10-5 (1.3  ±  0.3)  ×  10-4 (5.9  ±  4.2)  ×  10-4 (3.0  ±  1.2)  ×  10-4 (1.4  ±  0.2)  ×  10-4
12+log(N/H) 8.43  ±  0.24 7.82  ±  0.29 7.52  ±  0.14 8.11  ±  0.10 8.77  ±  0.31 8.48  ±  0.17 8.15  ±  0.06

Notes. The evolutionary masses are determined using the tracks of Brott et al. (2011) with an initial rotational velocity of 300 km s-1.

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