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




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Abstract: The star Cyg OB2 No. 9 is a well-known non-thermal radio emitter. Recenttheoretical work suggests that all such O-stars should be in a binary or amultiple system. However, there is no spectroscopic evidence of a binarycomponent. Re-analysis of radio observations from the VLA of this system over25 years has revealed that the non-thermal emission varies with a period of2.35+-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 derivedsome preliminary orbital parameters for this putative binary and revised themass-loss rate of the primary star downward from previous estimates.



Author: S. Van Loo, R. Blomme, S. M. Dougherty, M. C. Runacres

Source: https://arxiv.org/







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