Table 5.
Parameters and elemental abundances of the primary star of the system HD 96446.
| Sp. Type | B2 IV He-strong | |
|---|---|---|
| vrad, sys | 5.57 ± 0.02 km s−1 | |
| dspec | 741 ± 97 pc | |
| Bd | 4.64 ± 0.88 kG | |
| Atmospheric parameters: | ||
| Teff | 21800 ± 300 K | |
| log g (cgs) | 3.85 ± 0.10 | |
| y (number fraction) | 0.60 ± 0.03 | |
| Microturb. vel. ξ | 6 ± 1 km s−1 | |
| v sin i | 2 ± 1 km s−1 | |
| Macroturb. vel. ζ | 2 ± 1 km s−1 | |
| Non-LTE metal abundances: | ||
| HD 96446 | CAS | |
| log(C/H) + 12 | 8.24 ± 0.06 (13) | 8.33 ± 0.04 |
| log(N/H) + 12 | 7.97 ± 0.09 (57) | 7.79 ± 0.04 |
| log(O/H) + 12 | 8.56 ± 0.05 (53) | 8.76 ± 0.05 |
| log(Ne/H) + 12 | 8.14 ± 0.07 (13) | 8.09 ± 0.05 |
| log(Mg/H) + 12 | 7.31 ± 0.03 (2) | 7.56 ± 0.05 |
| log(Al/H) + 12 | 6.23 ± 0.08 (4) | 6.30 ± 0.07 |
| log(Si/H) + 12 | 7.19 ± 0.08 (13) | 7.50 ± 0.05 |
| log(S/H) + 12 | 7.24 ± 0.04 (23) | 7.14 ± 0.06 |
| log(Ar/H) + 12 | 6.50 ± 0.02 (6) | 6.50 ± 0.08 |
| log(Fe/H) + 12 | 7.35 ± 0.09 (27) | 7.52 ± 0.03 |
| Photometric data: | ||
| V | 6.686 ± 0.005 | |
| B − V | −0.138 ± 0.020 | |
| E(B − V) | 0.060 ± 0.003 | |
| MV | −2.85 ± 0.29 | |
| Mbol | −4.94 ± 0.29 | |
| Fundamental parameters: | ||
| M/M⊙ | 9.1 ± 0.3 | |
| R/R⊙ | 6.1 ± 0.9 | |
| log L/L⊙ | 3.87 ± 0.11 | |
| τ | 23.4 Myr |
|
| τ/τMS | 0.77 |
|
Notes. 1σ uncertainties are given. For abundances they are from the line-to-line scatter; systematic errors amount to an additional ∼0.15 dex. The number of lines considered for the abundance determination is given in brackets. The cosmic abundance standard (CAS, NP12) in the solar neighbourhood is given for reference, along with data for Al, S, and Ar from Przybilla et al. (2013).
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