Table 2
Stellar parameters and chemical abundances of HD 54879 and of the O9.7 V standard star HD 36512 (Sota et al. 2011).
| ID | Instrument | Teff | logg | logQ | ξ b | He/H |
| (K) | (dex) | (km s-1) | (by number) | |||
|
|
||||||
| HD 54879 | FORS 2 | 33 000 ± 1000 | 3.95 ± 0.10 | -a | 5 ± 3 | 0.10−0.12 |
| HARPS | 33 000 ± 1000 | 4.00 ± 0.10 | - a | 4 ± 1 | 0.10−0.12 | |
| HD 36512 | FIES | 33 400 ± 600 | 4.09 ± 0.11 | –13.46 | 10 | 0.10 |
|
|
||||||
| log ϵSi | log ϵMg | log ϵC | log ϵN | log ϵO | ||
|
|
||||||
| HD 54879 | FORS 2 | 7.3 ± 0.3 | 7.4 ± 0.3 | 7.8 ± 0.3 | 7.5 ± 0.3 | 8.6 ± 0.2 |
| HARPS | 7.4 ± 0.2 | 7.4 ± 0.1 | 8.1 ± 0.2 | 7.7 ± 0.2 | 8.6 ± 0.1 | |
|
|
||||||
| ⊙ | 7.51 | 7.60 | 8.43 | 7.83 | 8.69 | |
| CAS | 7.50 | 7.56 | 8.33 | 7.79 | 8.76 | |
Notes.
The parameter 
(Puls et al. 1996) relies mainly on the Balmer lines, which for HD 54879 are not suitable for setting the mass-loss rate (Sect. 4).
Microturbulence. The solar abundances (⊙) are taken from Asplund et al. (2009). The cosmic abundance standard (CAS) composition from Nieva & Przybilla (2012) is also listed, log ϵX = log (X /H ) + 12 (by number).
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