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Table 1.
Adopted parameters for the three selected systems.
| Cyg OB2 #8A | HD 167971 | WR 140 | |
|---|---|---|---|
| Spectral clas. | O6If + O5.5III(f) | (O7.5III + O9.5III) + O9.5 I | WC7 + O5.5III-I |
| Ṁ (A) (M⊙ yr−1) | 1.8 × 10−6 | 2.4 × 10−7–1.4 × 10−7 | 2.0 × 10−5 |
| Ṁ (B) (M⊙ yr−1) | 1.4 × 10−6 | 3.3 × 10−7 | 1.9 × 10−6 |
| V∞(A) (km s−1) | 3000 | 4400–2600 | 2200 |
| V∞(B) (km s−1) | 2900 | 2900 | 2900 |
| ηwind | 0.75 | 0.67 | 0.13 |
| Te(A) (K) | 17900 | 16750–15100 | 37500 |
| Te(B) (K) | 19000 | 14200 | 18750 |
| P (d) | 21.908 | 7806 | 2896.5 |
| e | 0.24 | 0.44 | 0.894 |
| i (∘) | 31 | 145.2 | 120 |
| a (R⊙) | 146 | 6827 | 3137 |
| d (pc) | 1700 | 1700 | 1810 |
| ϕ | 0.49 | 0.88 | 0.78 |
| rA (cm) | 6.7 × 1012 | 2.1 × 1014 | 2.4 × 1014 |
| rB (cm) | 5.8 × 1012 | 1.8 × 1014 | 6.4 × 1013 |
| V (cm3) | 9.8 × 1038 | 2.9 × 1043 | 1.3 × 1042 |
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