Table 5.
Physical parameters of the OB stars in W51.
| # | Field | log(Teff) | AKs(N09) (a) | AKs(I05) (b) | log(L)(N09) (a) | log(L)(I05) (b) | Mass (a) | Mass (b) | Avarage mass |
|---|---|---|---|---|---|---|---|---|---|
| (K) | (mag) | (mag) | (L⊙) | (L⊙) | (M⊙) | (M⊙) | (M⊙) | ||
| 1 | IV | 4.63 ± 0.02 | 0.94 ± 0.05 | 1.25 ± 0.18 | 5.62 ± 0.08 | 5.74 ± 0.10 | 50 |
58 |
54 |
| 2 | III | 4.63 ± 0.02 | 1.85 ± 0.12 | 2.47 ± 0.37 | 5.86 ± 0.09 | 6.11 ± 0.17 |  |
 |
 |
| 3 | II | 4.60 ± 0.05 | 3.54 ± 0.17 | 4.70 ± 0.68 | 6.13 ± 0.17 | 6.59 ± 0.32 |  |
 |
 |
| 4 | III | 4.43 ± 0.10 | 1.53 ± 0.09 | 2.03 ± 0.30 | 4.77 ± 0.21 | 4.97 ± 0.24 |  |
 |
 |
| 5 | III | 4.59 ± 0.02 | 1.99 ± 0.10 | 2.65 ± 0.39 | 5.41 ± 0.09 | 5.67 ± 0.17 |  |
 |
 |
| 6 | II | 4.43 ± 0.10 | 3.04 ± 0.15 | 4.04 ± 0.59 | 5.02 ± 0.22 | 5.42 ± 0.32 |  |
 |
 |
| 7 | II | 4.33 ± 0.09 | 2.45 ± 0.12 | 3.25 ± 0.48 | 4.16 ± 0.23 | 4.48 ± 0.29 |  |
 |
 |
| 8 | IV | 4.02 ± 0.08 | 0.50 ± 0.04 | 0.67 ± 0.11 | 2.36 ± 0.18 | 2.43 ± 0.19 |  |
 |
 |
| 9 | IV | 4.14 ± 0.10 | 0.86 ± 0.06 | 1.15 ± 0.18 | 2.85 ± 0.25 | 2.97 ± 0.25 |  |
 |
 |
| 10 | III | 4.02 ± 0.08 | 0.49 ± 0.04 | 0.65 ± 0.11 | 2.24 ± 0.18 | 2.30 ± 0.19 | – (c) | – (c) | – (c) |
| 11 | IV | 4.19 ± 0.04 | 0.36 ± 0.03 | 0.48 ± 0.08 | 2.70 ± 0.12 | 2.75 ± 0.12 |  |
 |
 |
| 12 | II | 4.30 ± 0.10 | 3.96 ± 0.19 | 5.27 ± 0.77 | 4.41 ± 0.34 | 4.93 ± 0.45 |  |
 |
 |
| 13 | II | 4.19 ± 0.04 | 1.66 ± 0.09 | 2.20 ± 0.33 | 3.18 ± 0.12 | 3.40 ± 0.18 |  |
 |
 |
| 14 | III | 4.19 ± 0.04 | 2.16 ± 0.10 | 2.87 ± 0.42 | 3.37 ± 0.12 | 3.65 ± 0.20 |  |
 |
 |
| 15 | III | 4.02 ± 0.08 | 1.28 ± 0.07 | 1.69 ± 0.25 | 2.24 ± 0.18 | 2.41 ± 0.21 |  |
 |
 |
| 50 (d) | II | 4.58 ± – | 2.88 ± 0.14 | 3.82 ± 0.56 | 5.42 ± – | 5.80 ± – | 37 | 60 | 49 |
| 57 (d) | II | 4.63 ± – | 3.16 ± 0.15 | 4.20 ± 0.61 | 6.26 ± – | 6.68 ± – | 120 | 200 | 160 |
| 61 (d) | II | 4.58 ± – | 3.76 ± 0.18 | 5.00 ± 0.73 | 5.60 ± – | 6.10 ± – | 45 | 90 | 68 |
| W51d (e) | II | 4.63 ± – | 2.63 ± 0.14 | 3.50 ± 0.52 | 6.11 ± – | 6.46 ± – | 100 | 170 | 135 |
Notes.
Stellar properties derived assuming the extinction law of Nishiyama et al. (2009).
Stellar properties derived assuming the extinction law of Indebetouw et al. (2005).
Spectral types and photometry taken from Figuerêdo et al. (2008). There is no uncertainty quoted on the spectral type, therefore no errors are given for the Teff and L.
Spectral types and photometry taken from Barbosa et al. (2008). There is no uncertainty quoted on the spectral type,therefore no errors are given for the Teff and L.
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