SIMBAD references

2008A&A...483..585V - Astronomy and Astrophysics, volume 483, 585-590 (2008/5-4)

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

VAN LOO S., BLOMME R., DOUGHERTY S.M. and RUNACRES M.C.

Abstract (from CDS):

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±0.02yr. 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.

Abstract Copyright:

Journal keyword(s): stars: individual: Cyg OB2 No. 9 - stars: early-type - stars: mass-loss - radiation mechanisms: non-thermal

CDS comments: Table A1 : Notes : Several sources not identified.

Simbad objects: 11

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2019.10.21-13:38:18

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