Table 1
Summary of Teff and log g results for the IACOB and VFTS O-dwarf (V) samples.
| SpT | # Stars | Teff [kK] | log gc [dex] | SpT | # Stars | Teff [kK] | log gc [dex] | |||||||||
| MW (IACOB) | Mean | Range1 | Mean | Range | 30 Dor (VFTS) | Mean | Range | Mean | Range | |||||||
| O4 | 2 | 42.2 | 1.8 | 3.82 | 0.00 | O4 | 3 | 43.8 | 2.0 | 3.89 | 0.20 | |||||
| O4.5 | 2 | 42.1 | 0.6 | 3.78 | 0.11 | O4.5 | 0 | − | − | − | − | |||||
| O5 | 1 | 40.4 | − | 3.84 | − | O5 | 4 | 41.2 | 4.7 | 3.99 | 0.45 | |||||
| O5.5 | 0 | − | − | − | − | O5.5 | 1 | 41.2 | − | 4.03 | − | |||||
| O6 | 1 | 39.4 | − | 3.81 | − | O6 | 6 | 40.8 | 2.1 | 4.00 | 0.39 | |||||
| O6.5 | 4 | 38.7 | 1.7 | 3.79 | 0.28 | O6.5 | 4 | 40.0 | 0.7 | 4.08 | 0.14 | |||||
| O7 | 7 | 37.0 | 2.3 | 3.79 | 0.52 | O7 | 3 | 38.4 | 2.2 | 4.05 | 0.24 | |||||
| O7.5 | 4 | 36.9 | 3.5 | 3.85 | 0.49 | O7.5 | 0 | − | − | − | − | |||||
| O8 | 2 | 34.5 | 1.4 | 3.60 | 0.22 | O8 | 6 | 37.2 | 3.8 | 4.08 | 0.26 | |||||
| O8.5 | 4 | 36.5 | 3.5 | 4.05 | 0.34 | O8.5 | 7 | 36.9 | 0.9 | 4.09 | 0.31 | |||||
| O9 | 2 | 35.5 | 0.8 | 4.05 | 0.31 | O9 | 5 | 34.7 | 2.1 | 4.07 | 0.38 | |||||
| O9.2 | 1 | 34.6 | − | 4.09 | − | O9.2 | 3 | 35.2 | 1.8 | 4.10 | 0.12 | |||||
| O9.5 | 1 | 34.1 | − | 3.99 | − | O9.5 | 9 | 34.5 | 2.4 | 4.19 | 0.21 | |||||
| O9.7 | 2 | 33.1 | 0.6 | 4.05 | 0.09 | O9.7 | 2 | 33.7 | 0.1 | 4.14 | 0.07 | |||||
Notes. Typical uncertainties in Teff for the VFTS sample are in the range ±0.5−1.5 kK, while the formal errors in log g range between 0.07 and 0.15 dex (however, systematic errors make 0.10 dex a more reasonable lower limit in Δlog g, see Sabín-Sanjulián et al. 2014). Typical uncertainties in results for the IACOB sample are on the same order or slightly smaller in some cases. (1) Difference between the highest and lowest values.
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