A Spectroscopic study of the non-thermal radio emitter Cyg OB2 #8A: Discovery of a new binary system

Details A Spectroscopic study of the non-thermal radio emitter Cyg OB2 #8A: Discovery of a new binary system A Spectroscopic study of the non-thermal radio emitter Cyg OB2 #8A: Discovery of a new binary system

2004-08-02

arxiv.org/abs/astro-ph/0408027v1

Astron.Astrophys. 424 (2004) L39

Astronomy and Astrophysics

Astrophysics

4 pages, 3 postscript figures, accepted by A&A as a letter

Scientific paper

10.1051/0004-6361:200400049

We present the results of a spectroscopic campaign revealing that the non-thermal radio emitter Cyg OB2 #8A is an O6 + O5.5 binary system. We propose the very first orbital solution indicating a period of about 21.9 days. The system appears to be eccentric (0.24 +/- 0.04) and is likely seen under a rather low inclination angle. The mass ratio of the components is close to unity. The impact of the binarity of this star in the framework of our understanding of non-thermal radio emission from early-type stars is briefly discussed.

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