ORBi: Nazé Yaël - The first X-ray survey of Galactic Luminous Blue Variables

Reference : The first X-ray survey of Galactic Luminous Blue Variables


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/110808

Title :	The first X-ray survey of Galactic Luminous Blue Variables
Language :	English
Author, co-author :	Nazé, Yaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique observationnelle (sol et espace)]
	Rauw, Grégor [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales]
	Hutsemekers, Damien [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
Publication date :	Feb-2012
Journal title :	Astronomy and Astrophysics
Publisher :	EDP Sciences
Volume :	538
Pages :	A47, pp. 1-13
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0004-6361
e-ISSN :	1432-0746
City :	Les Ulis
Country :	France
Keywords :	[en] Astrophysics - Solar and Stellar Astrophysics ; Astrophysics - High Energy Astrophysical Phenomena
Abstract :	[en] Aims: The X-ray emission of massive stars has been studied when these objects are in their main-sequence phase, as well as in their Wolf-Rayet phase. However, the X-ray properties of the transitional Luminous Blue Variable (LBV) phase remain unknown. Methods: Using a dedicated but limited XMM survey as well as archival XMM and Chandra observations, we performed the first X-ray survey of LBVs: about half of the known LBVs or candidate LBVs are studied. Results: Apart from the well known X-ray sources eta Car and Cyg OB2 #12, four additional LBVs are detected in this survey, though some doubt remains on the association with the X-ray source for two of these. For the other LBVs, upper limits on the flux were derived, down to $\log[L_{\rm X}/L_{\rm BOL}]-9.4$ for PCyg. This variety in the strength of the X-ray emission is discussed, with particular emphasis on the potential influence of binarity.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/110808
Other URL :	http://arxiv.org/abs/1111.6375

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Open access	1111.6375v1.pdf		Author preprint	350.6 kB	View/Open

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