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The first orbital solution for the massive colliding-wind binary HD 93162 (=WR 25)
Gamen, R.; Gosset, Eric; Morrell, N. I. et al.
2008In Revista Mexicana de Astronomia y Astrofisica Conference Series
 

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Keywords :
binaries: spectroscopic; stars: individual (HD 93162); stars: Wolf-Rayet
Abstract :
[en] Since the discovery, with EINSTEIN, of strong X-ray emission associated with HD 93162, this object was recurrently predicted by some authors to be a colliding-wind binary system. However, radial-velocity variations that would prove the suspected binary nature have never been found so far. We spectroscopically monitored this object in order to investigate its possible variability and to provide an answer to the above-mentioned discordance. We derived radial velocities from spectroscopic data acquired mainly between 1994 and 2006, and searched for periodicities. For the first time, periodic radial-velocity variations are detected. Our analysis definitively shows that the Wolf-Rayet star WR 25 is actually an eccentric binary system with a probable period of about 208 days.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gamen, R.;  Departamento de Física, Universidad de La Serena, Benavente 980, La Serena, Chile (rgamen@dfuls.cl).
Gosset, Eric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Morrell, N. I.
Niemela, V. S.
Sana, H.
Nazé, Yaël  ;  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
Barbá, R. H.
Solivella, G. R.
Language :
English
Title :
The first orbital solution for the massive colliding-wind binary HD 93162 (=WR 25)
Publication date :
01 August 2008
Audience :
International
Main work title :
Revista Mexicana de Astronomia y Astrofisica Conference Series
Pages :
91-93
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since 02 July 2009

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