Table 2.
Revised orbital solution of Cyg OB2 #8A.
| Primary | Secondary | |
|---|---|---|
| Porb (days) | 21.9066 ± 0.0013 | |
| e | 0.18 ± 0.03 | |
| T0 (HJD−2 450 000) | 8005.66 ± 0.62 | |
| ω (°) | 207.6 ± 11.9 | |
| γ (km s−1) | −10.0 ± 2.8 | −18.8 ± 3.2 |
| K (km s−1) | 81.8 ± 2.9 | 102.8 ± 3.6 |
| q = m1/m2 | 1.26 ± 0.06 | |
| a sini (R⊙) | 34.8 ± 1.2 | 43.8 ± 1.5 |
| m sin3i (M⊙) | 7.6 ± 0.6 | 6.0 ± 0.5 |
| rms (km s−1) | 13.8 | 20.1 |
Notes. T0, ω, γ, K, and a sini stand, respectively, for the time of periastron passage, longitude of periastron of the primary measured from its ascending node, apparent systemic velocity, amplitude of the RV curve, and projected semi-major axis between the centre of the star and the centre of mass of the system.
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