Article (Scientific journals)
A binary signature in the non-thermal radio-emitter Cyg OB2 #9
Nazé, Yaël; De Becker, Michaël; Rauw, Grégor et al.
2008In Astronomy and Astrophysics, 483, p. 543-546
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Keywords :
stars: binaries: spectroscopic; stars: early-type; stars: individual: Cyg OB2 #9
Abstract :
[en] 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 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Barbieri, Cesare
Language :
English
Title :
A binary signature in the non-thermal radio-emitter Cyg OB2 #9
Publication date :
May 2008
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
483
Pages :
543-546
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 December 2008

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