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Table 2.
Derived parameters of studied stars.
| Parameter | HD 49798 | BD+18° 2647 | Sun |
|---|---|---|---|
| Teff [K] | 45 900 ± 800 | 73 000 ± 2000 | |
| log (g/1 cm s−2) | 4.56 ± 0.08 | 5.95 ± 0.03 | |
| R [R⊙] | 1.05 ± 0.06 | 0.107 ± 0.011 | |
| M [M⊙] | 1.46 ± 0.32 | 0.38 ± 0.08 | |
| εHe | 0.74 ± 0.07 | 0.029 ± 0.010 | 0.085 |
| logεC | < − 4.2 | < − 7.0 | −3.57 |
| logεN | −3.1 ± 0.2 | −4.5 ± 0.5 | −4.17 |
| logεO | −4.6 ± 0.2 | −5.4 ± 0.5 | −3.31 |
| logεF | < − 8.0 | −7.44 | |
| logεNe | < − 7.5 | −4.07 | |
| logεMg | −4.2 | −4.40 | |
| logεAl | −4.9 ± 0.4 | −5.55 | |
| logεSi | −4.1 ± 0.2 | −6.4 ± 0.4 | −4.49 |
| logεS | −6.3 ± 0.5 | −4.88 | |
| logεFe | −3.9 ± 0.2 | −3.7 ± 0.2 | −4.50 |
| logεNi | −5.0 ± 0.1 | −3.7 ± 0.3 | −5.78 |
| vrad [km s−1] | 107.9 ± 2.9 (*) | 64.5 ± 3.0 (*) | |
| vrot sini [km s−1] | 40 ± 5 | 25 ± 5 | |
| d [pc] | 508 ± 17 | 307 ± 9 | |
| Ṁ [M⊙ yr−1] | 2.1 × 10−9 | < 10−12 | |
| v∞ [km s−1] | 1570 | ||
| Ṁ⊙ [M⊙ yr−1] | 2.7 × 10−9 | 3.9 × 10−11 | |
 [km s−1] |
1550 | 1800 |
Notes. Solar abundances were taken from Asplund et al. (2009). Blank items denote values that were not determined.
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