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Title:
A Spectroscopic study of the non-thermal radio emitter Cyg OB2 #8A: Discovery of a new binary system
Authors:
De Becker, M.; Rauw, G.; Manfroid, J.
Affiliation:
AA(Institut d'Astrophysique et de Géophysique, Université de Liège, 17, Allée du 6 Août, B5c, 4000 Sart Tilman, Belgium ), AB(Institut d'Astrophysique et de Géophysique, Université de Liège, 17, Allée du 6 Août, B5c, 4000 Sart Tilman, Belgium ), AC(Institut d'Astrophysique et de Géophysique, Université de Liège, 17, Allée du 6 Août, B5c, 4000 Sart Tilman, Belgium )
Publication:
Astronomy and Astrophysics, v.424, p.L39-L42 (2004) (A&A Homepage)
Publication Date:
09/2004
Origin:
A&A
Astronomy Keywords:
binaries: spectroscopic, stars: early-type, stars: fundamental parameters, stars: individual: Cyg OB2 #8A
DOI:
10.1051/0004-6361:200400049
Bibliographic Code:
2004A&A...424L..39D

Abstract

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.

Based on observations collected at the Observatoire de Haute Provence, France.

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