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Table 2

Orbital solution for Cyg OB2 #9.

Parameter Value

P   (d) – this paper 860.0 ± 3.7
T 0 4020.72 ± 2.55
e 0.710 ± 0.016
ω1  (°) 191.9 ± 2.9
M1/M2 1.13 ± 0.08
γ1 (km s-1) − 33.9 ± 2.7
γ2 (km s-1) 1.0 ± 2.8
K1 (km s-1) 61.1 ± 3.0
K2 (km s-1) 68.9 ± 3.4
a1sini   (R) 730.1 ± 39.8
a2sini   (R) 823.2 ± 44.9

Notes.Based on the period derived in Sect. 3.2 and the optical spectra from Paper I. The present table supersedes the values given in Paper I. T0 corresponds to periastron passage, in HJD− 2   450   000.

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