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Table 3
Parameters and elemental abundances of CPD −57° 3509.
| Sp. Type | B2 IV He-strong | |
| v rad | −16 ...−20 km s-1 | |
| d spec | 2630 ± 370 pc | |
| B d | ≳3300 G | |
| Atmospheric parameters: | ||
| T eff | 23750 ± 250 K | |
| log g (cgs) | 4.05 ± 0.10 | |
| y (number fraction) | 0.28 ± 0.02 | |
| ξ | 2 ± 1 km s-1 | |
| vsini | 35 ± 2 km s-1 | |
| ζ | 10 ± 2 km s-1 | |
| Non-LTE metal abundances: | ||
| log (C/H) + 12 | 8.37 ± 0.09 (5) | |
| log (N/H) + 12 | 7.70 ± 0.07 (20) | |
| log (O/H) + 12 | 8.65 ± 0.08 (36) | |
| log (Ne/H) + 12 | 8.05 ±0.15 (2) | |
| log (Mg/H) + 12 | 7.17 (1) | |
| log (Al/H) + 12 | 5.93 ± 0.07 (4) | |
| log (Si/H) + 12 | 7.16 ±0.05 (7) | |
| log (S/H) + 12 | 7.17 ± 0.04 (4) | |
| log (Ar/H) + 12 | 6.68 ± 0.04 (2) | |
| log (Fe/H) + 12 | 7.30 ± 0.04 (6) | |
| Photometric data: | ||
| V | 10.68 ± 0.06 mag | |
| B − V | 0.10 ± 0.03 mag | |
| E(B − V) | 0.33 ± 0.03 mag | |
| M V | −2.47 ± 0.33 mag | |
| M bol | −4.86 ± 0.33 mag | |
| Fundamental parameters: | ||
| Ekström et al. (2012) | Brott et al. (2011) | |
| tracks | tracks/Bonnsai | |
| M / M ⊙ | 9.7 ± 0.3 | 9.2 ± 0.4 |
| R / R ⊙ | 5.0 ± 0.9 | 4.4 |
| log L/L⊙ | 3.85 ± 0.13 | 3.76 |
| τ | 13.8 Myr |
13.0 Myr |
| τ / τ MS | 0.51 |
0.47 |
|
|
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Notes.1σ-uncertainties are given. For abundances these are from the line-to-line scatter, systematic errors amount to an additional ~0.1 dex.
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