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Individual sheet: Cyg OB2-5
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Spectral type(s): (Ofpe/WN9 + O6-7I) + OB? + B0V(?)
Multiplicity:
Quadruple system
Period(s): 6.598 d/6.7 yr/several kyr
Orbital solution: no
Ref: Rauw et al.(1999), Kennedy et al.(2010), Linder et al.(2009)
Quality flag (Q): I
Comments:
The dominant non-thermal radio source should be coincident with the wind-wind interaction region associated to the 6.7 yr orbit (Kennedy et al.2010, Ortiz-Léon et al.2011). Another source of non-thermal radio emission seems to be associated to the wider orbit, and has been resolved (Contreras et al.1997).
Upper limits on the hard X-ray emission based on INTEGRAL observations have been published in De Becker et al. (2007).