A binary signature in the non-thermal radio-emitter Cyg OB2 #9

Details A binary signature in the non-thermal radio-emitter Cyg OB2 #9 A binary signature in the non-thermal radio-emitter Cyg OB2 #9

2008-03-21

arxiv.org/abs/0803.3176v1

Astronomy and Astrophysics

Astrophysics

accepted by A&A, 4 p, 3figures

Scientific paper

10.1051/0004-6361:200809491

Aims: Non-thermal radio emission associated with massive stars is believed to arise from a wind-wind collision in a binary system. However, the evidence of binarity is still lacking in some cases, notably Cyg OB2 #9 Methods: For several years, we have been monitoring this heavily-reddened star from various observatories. This campaign allowed us to probe variations both on short and long timescales and constitutes the first in-depth study of the visible spectrum of this object. Results: Our observations provide the very first direct evidence of a companion in Cyg OB2 #9, confirming the theoretical wind-wind collision scenario. These data suggest a highly eccentric orbit with a period of a few years, compatible with the 2yr-timescale measured in the radio range. In addition, the signature of the wind-wind collision is very likely reflected in the behaviour of some emission lines.

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