Journal
ASTRONOMY & ASTROPHYSICS
Volume 424, Issue 3, Pages L39-L42Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:200400049
Keywords
binaries : spectroscopic; stars : early-type; stars : fundamental parameters; stars : individual : Cyg OB2#8A
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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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