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The peculiar Of?p stars HD 108 and HD 191612
Nazé, Yaël; Rauw, Grégor; Walborn, N. R. et al.
2005In Massive Stars and High-Energy Emission in OB Associations
 

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Abstract :
[en] The Of?p spectral category was introduced by Walborn in 1972 to describe peculiar stars which possess intense emission lines of C III 4647,4650,4651. Recently, two of them, HD 108 and HD 191612, were found to display spectacular line profile variations in the visible domain: these stars apparently alternate between two different spectral states (O6-O8). To discover the origin of this intriguing behaviour, a multiwavelength campaign was undertaken. In this context, the analysis of the X-ray emission is especially important since it provides crucial information for constraining the nature of these peculiar objects and testing conflicting models. We are therefore carrying out high-quality XMM-Newton observations of these stars and we present the results of the data obtained up to now.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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
Walborn, N. R.
Howarth, I. D.
Language :
English
Title :
The peculiar Of?p stars HD 108 and HD 191612
Publication date :
01 November 2005
Audience :
International
Main work title :
Massive Stars and High-Energy Emission in OB Associations
Pages :
31-34
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since 02 July 2009

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