Table 2
Stellar+wind parameters and abundances of HD 2905.
| This work | Literature | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Averaged | Multi epoch | C06 | S08 | Unit | |||||
| vsini | 58 | ± 5 | 59 | ± 6 | [48, 70] | 91a | 91a | km s−1 | |
| vmac | 82 | ± 6 | 81 | ± 8 | [68, 95] | – | – | km s−1 | |
| Teff | 24.6 | ± 0.3 | 24.5 | ± 0.3 | [23.7, 25.1] | 21.5 | 23.5 | kK | |
| log g | 2.79 | ± 0.05 | 2.79 | ± 0.05 | [2.68, 2.92] | 2.60 | 2.75 | dex | |
| N(He)/N(H) | 0.11 | ± 0.02 | 0.10 | ± 0.02 | [0.08, 0.14] | – | – | ||
| log Q | −12.73 | ± 0.05 | −12.74 | ± 0.05 | [−12.83, −12.66] | −12.7b | −12.4b | ||
| β | 1.56 | ± 0.10 | 1.55 | ± 0.20 | [1.24, 1.96] | 2.0 | 1.5 | ||
| ξt | 19.0 | ± 1.0 | 19.9 | ± 1.2 | [18.4, 22.5] | 20 | 20 | km s−1 | |
| log(Si/H) + 12 | 7.84 | ± 0.10 | 7.79 | ± 0.14 | [7.50, 7.96] | – | – | dex | |
| log(N/H) + 12 | 7.69 | ± 0.08 | 7.67 | ± 0.04 | [7.59, 7.73] | 8.00 | 8.16 | dex | |
| log(O/H) + 12 | 8.89 | ± 0.05 | 8.87 | ± 0.04 | [8.77, 8.93] | 8.75 | 8.80 | dex | |
| log(Mg/H) + 12 | 7.43 | ± 0.09 | 7.42 | ± 0.04 | [7.34, 7.48] | – | – | dex | |
| log L∕L⊙ | 5.69 | ± 0.12c | – | 5.52 | 5.48 | ||||
| Ṁ | 1.7 | ± 0.6c | – | 2.0 | 2.5 | 10−6 M⊙ yr-1 | |||
| R | 39 | ± 5c | – | 41.4 | 33.0 | R⊙ | |||
Notes. The second and third columns correspond to the outcome of our FASTWIND analysis of the mean of 56 spectra obtained during the HERMES-2 run (central values and associated uncertainties), while the fourth, fifth, and sixth columns list the results from the individual spectra (mean value, standard deviation, minimum and maximum values of individual estimates, respectively). We also include the set of parameters and abundances determined by Crowther et al. (2006) and Searle et al. (2008) for comparison. (a) Adopted from Howarth et al. (1997). This value assumes that all line-broadening is due to rotation. (b) Computed using the values of Ṁ and R in the table, plus v∞ = 1105 km s−1 (Prinja et al. 1990). (c) Computed using the values of Teff, log g and log Q in the table, plus v∞ = 1105 km s−1 and MV = − 7.1 (see text).
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