Article (Scientific journals)
On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray source 3EG J2033+4118
De Becker, Michaël; Rauw, Grégor; Swings, Jean-Pierre
2005In Astrophysics and Space Science, 297 (1-4), p. 291-298
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Keywords :
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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Rauw, Grégor  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Swings, Jean-Pierre ;  Université de Liège - ULiège > Département d'astrophys.
Language :
English
Title :
On the multiplicity of the O-star Cyg OB2#8a and its contribution to the gamma-ray source 3EG J2033+4118
Publication date :
January 2005
Journal title :
Astrophysics and Space Science
ISSN :
0004-640X
eISSN :
1572-946X
Publisher :
Springer, Dordrecht, Netherlands
Volume :
297
Issue :
1-4
Pages :
291-298
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2009

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