Table 3
Atmospheric parameters and metal abundances (on the scale in which log ϵ[H] = 12) for the reference stars and for HD 93521.
| Teff [K] | log g | y | log ϵ(C) | log ϵ(N) | log ϵ(O) | [N/C] | [N/O] | |||
| [4060–4082 Å] | [4995–5011 Å] | [4060–4082 Å] | [4691–4709 Å] | |||||||
|
|
||||||||||
| 10 Lac | 34 000 | 4.15 | 0.097 | 8.31 | 7.55 | 8.39 | 8.39 | –0.76 | –0.84 | |
| 34 254 | 4.20 | 0.079 | 8.22 | 7.44 | 8.34 | 8.28 | –0.78 | –0.87 | ||
| vsini = 390 km s-1 | 33 975 | 4.27 | 0.075 | 8.30 | 7.52 | 8.42 | 8.34 | –0.78 | –0.86 | |
|
|
||||||||||
| τ Sco | 31 500 | 4.05 | 0.085 | 8.19 | 8.15 | 8.62 | 8.62 | –0.04 | –0.47 | |
| 31 088 | 4.15 | 0.101 | 8.18 | 7.92 | 8.48 | 8.48 | –0.26 | –0.56 | ||
| vsini = 390 km s-1 | 30 983 | 4.18 | 0.096 | 8.42 | 8.08 | 8.74 | 8.64 | –0.34 | –0.61 | |
|
|
||||||||||
| HD 57682 | 33 000 | 4.00 | 0.096 | 8.20 | 7.52 | 8.31 | 8.31 | –0.68 | –0.79 | |
| 33 958 | 4.17 | 0.096 | 8.14 | 7.58 | 8.34 | 8.36 | –0.56 | –0.77 | ||
| vsini = 390 km s-1 | 31 814 | 3.97 | 0.079 | 8.04 | 7.52 | 8.54 | 8.38 | –0.52 | –0.94 | |
|
|
||||||||||
| HD 93521, sph. symm. | ||||||||||
| SOPHIE | 30 944 | 3.72 | 0.182 | 7.70 | 8.00 | 8.20 | 8.16 | +0.30 | –0.18 | |
| ELODIE | 30 892 | 3.62 | 0.174 | 7.42 | 7.94 | 8.28 | 8.32 | +0.52 | –0.36 | |
| Mean | 30 918 | 3.67 | 0.178 | 7.56 | 7.97 | 8.24 | 8.24 | +0.41 | –0.27 | |
|
|
||||||||||
| HD 93521, non sph. | ||||||||||
| SOPHIE | 7.74 | 8.03 | 8.22 | 8.22 | +0.29 | –0.19 | ||||
| ELODIE | 7.49 | 7.97 | 8.32 | 8.34 | +0.48 | –0.36 | ||||
| Mean | 7.62 | 8.00 | 8.27 | 8.28 | +0.38 | –0.27 | ||||
Notes. The reference values based on classical methods are shown in boldface. For the standard stars, the second line yields the results of our analysis of the actual spectra of these stars using the same approach as for HD 93521, whilst the third line gives the corresponding results for the spectra degraded to the vsini of HD 93521. The solar [N/C] and [N/O] abundance ratios are –0.60 and –0.86, respectively (Asplund et al. 2009).
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