Reference : On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray so...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/5165
On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray source 3EG J2033+4118
English
De Becker, Michaël mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Rauw, Grégor mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Swings, Jean-Pierre mailto [Université de Liège - ULg > Département d'astrophys.]
Jan-2005
Astrophysics & Space Science
Springer
297
1-4
291-298
Yes (verified by ORBi)
International
0004-640X
Dordrecht
[en] binaries : spectroscopic ; stars : individual : Cyg OB2 #8A ; stars : early-type ; radiation mechanisms : non-thermal
[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.
http://hdl.handle.net/2268/5165
http://arxiv.org/abs/astro-ph/0407641

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