Reference : A binary signature in the non-thermal radio-emitter Cyg OB2 #9
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/2774
A binary signature in the non-thermal radio-emitter Cyg OB2 #9
English
Nazé, Yaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
De Becker, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
Barbieri, Cesare [ > > ]
May-2008
Astronomy and Astrophysics
EDP Sciences
483
543-546
Yes (verified by ORBi)
International
0004-6361
Les Ulis
France
[en] stars: binaries: spectroscopic ; stars: early-type ; stars: individual: Cyg OB2 #9
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/2774
10.1051/0004-6361:200809491
http://arxiv.org/abs/0803.3176

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