Table 2
Fundamental stellar parameters.
| Star | Sp. type | Teff | log gc |
|
log (Ṁ) | β | f | v∞ | ξ t | vsin i | Mspec | Mevol | Age |
| [kK] | [cgs] | [km s-1] | [M⊙] | [M⊙] | [Myr] | ||||||||
|
|
|||||||||||||
| MPG 355 | ON2III(f∗) | 51.7 | 4.00 | 6.04 | –6.74 | 0.8 | 0.02 | 2800 | 25 | 120 | 64 ± 13.2 | >70? | ≥3? |
| AzV177 | O4V((f)) | 44.5 | 4.03 | 5.43 | –6.85 | 1.0 | 0.05 | 2400 | 25 | 220 | 31.9 ± 7.2 | 38.8 |
1.6 |
| AzV 388 | O4V | 43.1 | 4.01 | 5.54 | –7.00 | 1.3 | 0.11 | 2100 | 20 | 150 | 41.4 ± 9.3 | 42.0 |
2.2 |
| MPG 324b | O4V | 42.1 | 4.00 | 5.51 | –6.85 | 1.0 | 0.07 | 2300 | 15 | 70 | 39.5 ± 9.0 | 40.0 |
2.3 |
| MPG 368b | O6V | 39.3 | 3.75 | 5.38 | –7.43 | 1.0 | 0.10 | 2100 | 15 | 60 | 26.0 ± 5.9 | 33.2 |
3.0 |
| MPG 113 | OC6Vz | 39.6 | 4.00 | 5.15 | –8.52 | 0.8 | ... | 1250 | 10 | 35 | 24.6 ± 5.6 | 27.8 |
2.8 |
| AzV 243 | O6V | 39.6 | 3.90 | 5.59 | –7.10 | 1.0 | 0.05 | 2000 | 15 | 60 | 40.8 ± 9.2 | 41.0 |
3.0 |
| AzV446c | O6.5V | 39.7 | 4.00 | 5.25 | –8.40 | 0.8 | 0.10 | 1400 | 5 | 30 | 28.6 ± 6.5 | 30.0 |
3.1 |
| MPG 356 | O6.5V | 38.2 | 4.10 | 4.88 | –8.46 | 0.8 | ... | 1400 | 5 | 20 | 18.0 ± 4.1 | 23.1 |
2.2 |
| AzV 429c | O7V | 38.3 | 4.01 | 5.13 | –8.40 | 0.8 | 0.10 | 1300 | 10 | 120 | 26.3 ± 6.0 | 26.5 |
3.3 |
| MPG 523 | O7Vz | 38.7 | 4.25 | 4.80 | –9.22 | 0.8 | ... | 1950 | 10 | 50 | 20.1 ± 4.5 | 23.1 |
0.5 |
| NGC346-046 | O7Vn | 39.0 | 4.22 | 4.81 | –9.22 | 0.8 | ... | 1950 | 10 | 300 | 19.0 ± 4.3 | 23.7 |
0.3 |
| NGC346-031 | O8Vz | 37.2 | 4.00 | 4.95 | –9.22 | 0.8 | ... | 1540 | 5 | 25 | 18.6 ± 4.2 | 23.2 |
3.3 |
| AzV 461 | O8V | 37.1 | 4.05 | 5.00 | –9.00 | 0.8 | ... | 1540 | 10 | 200 | 23.8 ± 5.4 | 23.8 |
3.6 |
| MPG 299 | O8Vn | 36.3 | 4.25 | 4.64 | –8.52 | 0.8 | ... | 1540 | 5 | 360 | 18.3 ± 4.1 | 19.5 |
1.5 |
| MPG 487a | O8V | 35.8 | 4.00 | 5.12 | –8.52 | 0.8 | .... | 1540 | 2 | 20 | 31.7 ± 7.1 | 25.7 |
4.3 |
| AzV 267c | O8V | 35.7 | 4.04 | 4.90 | –8.60 | 0.8 | 0.10 | 1250 | 10 | 220 | 21.9 ± 5.0 | 21.5 |
4.2 |
| AzV 468c | O8.5V | 34.7 | 4.00 | 4.76 | –9.15 | 0.8 | ... | 1540 | 5 | 50 | 15.7 ± 3.5 | 19.3 |
4.3 |
| AzV 148a,c | O8.5V | 32.3 | 4.00 | 4.84 | –8.70 | 0.8 | ... | 1540 | 12 | 60 | 25.3 ± 5.7 | 19.0 |
6.2 |
| MPG 682 | O9V | 34.8 | 4.10 | 4.89 | –9.05 | 0.8 | ... | 1250 | 5 | 40 | 26.6 ± 6.0 | 20.8 |
4.7 |
| AzV 326a | O9V | 32.4 | 4.03 | 4.81 | –9.15 | 0.8 | ... | 1250 | 5 | 200 | 25.3 ± 5.7 | 18.8 |
6.1 |
| AzV 189a | O9V | 32.3 | 4.02 | 4.81 | –9.22 | 0.8 | ... | 1250 | 5 | 150 | 24.8 ± 5.6 | 18.8 |
6.1 |
| MPG 012 | B0IV | 31.0 | 3.65 | 4.93 | –9.30 | 0.8 | ... | 1250 | 5 | 60 | 17.1 ± 3.9 | 21.0 |
6.5 |
Notes.Ṁ are given in M⊙ yr-1. Evolutionary masses (Mevol) were derived from the tracks by Brott et al. (2011a) (see text for more comments). Uncertainties on Teff are ±1500 K, ±0.1 dex for log g (except AzV 446, AzV 429, AzV 267, AzV 468 and AzV 148, ±0.2 dex), ±0.1 dex on log L/L⊙. As for the wind quantities, an uncertainty of ±0.04 dex was estimated for stars with P Cygni profiles, while v∞ was measured within ±100 km s-1. For stars without P Cygni profiles, see Sect. 3.2 for the procedure we adopted.
Stars whose photometry was interpreted as indicating binarity (cf. Sect. 5.1).
Stars showing radial velocity variations (cf. Sect. 5.1).
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