Non-thermal radio emission from O-type stars III. Is Cyg OB2 No. 9 a wind-colliding binary?

Details Non-thermal radio emission from O-type stars III. Is Cyg OB2 No. 9 a wind-colliding binary? Non-thermal radio emission from O-type stars III. Is Cyg OB2 No. 9 a wind-colliding binary?

2008-03-18

arxiv.org/abs/0803.2607v1

Astronomy and Astrophysics

Astrophysics

13 pages, 5 figures, includes online data, accepted by A&A

Scientific paper

10.1051/0004-6361:200809367

The star Cyg OB2 No. 9 is a well-known non-thermal radio emitter. Recent theoretical work suggests that all such O-stars should be in a binary or a multiple system. However, there is no spectroscopic evidence of a binary component. Re-analysis of radio observations from the VLA of this system over 25 years has revealed that the non-thermal emission varies with a period of 2.35+-0.02 yr. This is interpreted as a strong suggestion of a binary system, with the non-thermal emission arising in a wind-collision region. We derived some preliminary orbital parameters for this putative binary and revised the mass-loss rate of the primary star downward from previous estimates.

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