Table 3
Star and wind parameters of Cyg OB2 #9.
| Primary | Secondary | |
|
|
||
| Spectral type | O5–O5.5I | O3–O4III |
| Teff (K) | 38 520–37 070 | 42 942–41 486 |
| log Lbol/L⊙ | 5.87–5.82 | 5.92–5.82 |
| M∗ (M⊙) | 50.87–48.29 | 58.62–48.80 |
| ν∞ (km s-1) | 2079–2041 | 2436–2303 |
| Ṁ (10-6 M⊙ yr-1) | 5.66–4.45 | 6.58–4.98 |
| 6 cm flux (mJy) | 0.25–0.18 | 0.25–0.18 |
| 20 cm flux (mJy) | 0.12–0.09 | 0.12–0.09 |
| Radius (R⊙) where τ6 cm = 1 | 1712–1502 | 1621–1420 |
| Radius (R⊙) where τ20 cm = 1 | 3964–3479 | 3754–3287 |
Notes.For each parameter, the range corresponds to the range in spectral types. The stellar parameters are from the calibration of Martins et al. (2005), the wind parameters are derived from the Vink et al. (2001) equations, and the radio fluxes from the Wright & Barlow (1975) equation. A distance of 1.45 kpc is assumed.
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