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Table 8.
Stellar parameters derived from the spectroscopic analysis, compared to those of the best-fitting MESA model.
| Spectroscopic fit |
MESA model |
Unit | |||
|---|---|---|---|---|---|
| SSN 7a | SSN 7b | Mass donor | Mass gainer | ||
| log L | 5.75 ± 0.15 | 5.78 ± 0.15 | 5.76 ± 0.1 | 5.74 ± 0.1 | [L⊙] |
| Teff | 43.6 ± 1.0 | 38.7 ± 1.0 | 43.6 ± 1.5 | 38.8 ± 1.5 | [kK] |
| log g | 3.7 ± 0.1 | 3.7 ± 0.1 | 3.68 ± 0.05 | 3.7 ± 0.05 | [cm s−2] |
| v sin i | 135 ± 10 | 150 ± 10 | – | – | [km s−1] |
| vrot | – | – | 222 ± 10 | 274 ± 10 | [km s−1] |
| log Ṁ | −5.4 ± 0.1 | −7.3 ± 0.4 | −5.87 ± 0.1 (a) | −5.75 ± 0.1 (a) | [M⊙ yr−1] |
| v∞ | 2500 ± 100 | 2500 ± 300 | – | – | [km s−1] |
| R | 13.2 ± 1.7 | 17.3 ± 2.1 | 13.5 ± 0.3 | 16.3 ± 0.5 | [R⊙] |
| RRL(b) |  |
 |
13.5 ± 0.3 | 16.3 ± 0.5 | [R⊙] |
| R/RRL | 1.01 | 1.03 | 1 | 1 | |
| M |  |
 |
33 ± 2 | 50 ± 5 | [M⊙] |
| XH | 0.60 ± 0.05 | 0.7375 | 0.51 ± 0.1 | 0.71 ± 0.02 | [mass fr.] |
| XHe | 0.39 ± 0.05 | 0.26 | 0.50 ± 0.1 | 0.28 ± 0.02 | [mass fr.] |
| XC × 105 |  |
21 ± 5 | 2 ± 2 | 26 ± 2 | [mass fr.] |
| XN × 105 |  |
 |
138 ± 2 | 43 ± 5 | [mass fr.] |
| XO × 105 |  |
80 (c) | 4 ± 2 | 80 ± 5 | [mass fr.] |
Notes.
(b)
Calculated using the period P = 3.07 d, as from the orbital analysis (see Sect. 3), and using the spectroscopic mass ratio.
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