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Table 11.
Estimated component masses based on the mass function and primary’s spectral types and a range of orbital inclinations.
| Object | Spectral type | P | f(M) | M1 | M2 | i |
|---|---|---|---|---|---|---|
| d | M⊙ | M⊙ | M⊙ | degrees | ||
| Pre-mass transfer systems | ||||||
| HD 164 438 | O9.2 IV | 10.2 | 0.0198 | 15–20 | 1.8−4.6 | 30−90 |
| HDE 229 234 | O9 III | 3.5 | 0.0450 | 18–23 | 3.1−7 | 30−70 |
| Cyg OB2-41 | O9.7 III(n) | 29.4 | 0.2080 | 15–23 | 4.3−10 | 35−90 |
| ALS 15 148 | O6.5 V | 3.1 | 0.0074 | 24–27 | 1.7−2.1 | 60−90 |
| Cyg OB2-1 | O8 IV(n)((f)) | 4.9 | 0.1640 | 18–21 | 4.3−6 | 60−90 |
| Cyg OB2-20 | O9.7 IV | 25.1 | 0.1640 | 15–18 | 3.9−9 | 35−90 |
| Cyg OB2-15 | O8 III | 14.7 | 0.0950 | 20–25 | 3.8−11 | 25−90 |
| Cyg OB2-11 | O5.5 Ifc | 72.5 | 0.0780 | 35–50 | 7−19 | 20−70 |
| V747 Cep | O5.5 V(n)((f)) | 5.5 | 0.4360 | 27–30 | 8−11 | 60−90 |
| HD 37 737 | O9.5 II-III(n) | 7.8 | 0.2200 | 18–25 | 5−7 | 60−90 |
| HD 46 573 | O7 V((f))z | 10.7 | 0.0007 | 21–23 | 0.8−1.5 | 30−60 |
| HD 52 533 A | O8.5 IVn | 22.0 | 1.0200 | 18–21 | 9−12 | 60−90 |
| Ongoing mass-transfer systems | ||||||
| BD +36 4063 | ON9.7 Ib | 4.8 | 2.06 | 15–23 | 11−18 | 60−90 |
| HD 16 429 AaAb | O9.2 III | 3.0 | 0.76 | 18–23 | 8−11 | 60−90 |
| Collapsed companions | ||||||
| V479 Sct | ON6 V((f))z | 3.9 | 0.0028 | 24–27 | 1.4−12 | 10−60 |
| Cyg X-1 | O9.7 Iabp var | 5.6 | 0.3410 | 20–40 | 6−16 | 35−60 |
| HD 12 323 | ON9.2 V | 1.9 | 0.0053 | 15–18 | 1.4−1.6 | 60−90 |
| HD 15 137 | O9 II-IIIn | 55.4 | 0.0082 | 15–20 | 1.5−9 | 10−60 |
| HD 14 633 AaAb | ON8.5 V | 15.4 | 0.0041 | 18–20 | 1.3−9 | 10−60 |
| Colliding wind binary or with compact companion | ||||||
| Cyg OB2-A11 | O7 Ib(f) | 15.4 | 0.0199 | 25–40 | 2.5−7 | 30−60 |
Notes. The mass function for each system is from the calculated orbit (see Table 10).
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