Reference : On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray sourc...

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/5165

Title :	On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray source 3EG J2033+4118
Language :	English
Author, co-author :	De Becker, Michaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
	Rauw, Grégor [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
	Swings, Jean-Pierre [Université de Liège - ULg > Département d'astrophys.]
Publication date :	Jan-2005
Journal title :	Astrophysics & Space Science
Publisher :	Springer
Volume :	297
Issue/season :	1-4
Pages :	291-298
Audience :	International
ISSN :	0004-640X
City :	Dordrecht
Keywords :	[en] binaries : spectroscopic ; stars : individual : Cyg OB2 #8A ; stars : early-type ; radiation mechanisms : non-thermal
Abstract :	[en] We present the results of an intensive spectroscopic campaign in the optical waveband revealing that Cyg OB2 # 8A is an O6+ O5.5 binary system with a period of about 21.9 days. Cyg OB2 # 8A is a bright X-ray source, as well as a non-thermal radio emitter. We discuss the binarity of this star in the framework of a campaign devoted to the study of non-thermal emitters, from the radio waveband to gamma-rays. In this context, we attribute the non-thermal radio emission from this star to a population of relativistic electrons, accelerated by the shock of the wind-wind collision. These relativistic electrons could also be responsible for a putative gamma-ray emission through inverse Compton scattering of photospheric UV photons, thus contributing to the yet unidentified EGRET source 3EG J2033+ 4118.
Permalink :	http://hdl.handle.net/2268/5165
Other URL :	http://arxiv.org/abs/astro-ph/0407641

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