期刊
ASTRONOMY & ASTROPHYSICS
卷 483, 期 2, 页码 543-546出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200809491
关键词
stars : binaries : spectroscopic; stars : early-type; stars : individual : CygOB2 #9
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 CygOB2 #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 CygOB2 #9, confirming the theoretical windwind collision scenario. These data suggest a highly eccentric orbit with a period of a few years, compatible with the 2 yr-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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