Reference : The peculiar Of?p stars HD 108 and HD 191612

	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/15957

Title :	The peculiar Of?p stars HD 108 and HD 191612
Language :	English
Author, co-author :	Nazé, Yaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales >]
	Rauw, Grégor [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
	Walborn, N. R. [> > > >]
	Howarth, I. D. [> > > >]
Publication date :	1-Nov-2005
Main document title :	Massive Stars and High-Energy Emission in OB Associations
Pages :	31-34
On invitation :	No
Audience :	International
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.
Target :	Professionals
Permalink :	http://hdl.handle.net/2268/15957
Other URL :	http://adsabs.harvard.edu/abs/2005mshe.work...31N

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