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Individual sheet: Cyg OB2-9
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Spectral type(s): O5I + O6-7I
Multiplicity:
Confirmed binary system
Period(s): 2.35 yr
Orbital solution: yes
Ref: Blomme et al.(2013)
Quality flag (Q): I
Comments:
The period determination is based on radio data.
Upper limits on the hard X-ray emission based on INTEGRAL observations have been published in De Becker et al. (2007).