Reference : The young open cluster NGC 6231: five years of investigations

	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/2268/16010

Title :	The young open cluster NGC 6231: five years of investigations
Language :	English
Author, co-author :	Sana, H. [Institut d'Astrophysique et de Géophysique, Liège University, Allée du 6 Aout 17, Bat. B5c, B-4000 Liège, Belgium) AB(Institut d'Astrophysique et de Géophysique, Liège University, Allée du 6 Aout 17, Bat. B5c, B-4000 Liège, Belgium) AC(Institut d'Astrophysique et de Géophysique, Liège University, Allée du 6 Aout 17, Bat. B5c, B-4000 Liège, Belgium]
	Rauw, Grégor [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales >]
	Gosset, Eric [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Publication date :	1-Nov-2005
Main document title :	Massive Stars and High-Energy Emission in OB Associations
Pages :	107-110
On invitation :	No
Audience :	International
Abstract :	[en] In this contribution, we present an overview of the main results obtained by the Liège multiwavelength (in the X-ray and optical domains) campaign on the young open cluster NGC 6231. We probe the distribution of the O star properties, and especially their binary nature. In this regard, we revise the O-type binary fraction and we briefly discuss the distribution of the binary parameters. We then present the latest developments of the canonical L[SUB]X[/SUB]-L[SUB]bol[/SUB] relation. We discuss the causes of the observed deviations from this relation and of the X-ray variability among O-type stars. Probing the population of low mass pre-main sequence stars detected in the X-ray domain, we propose a scenario for the star formation history in NGC 6231.
Permalink :	http://hdl.handle.net/2268/16010
Other URL :	http://adsabs.harvard.edu/abs/2005mshe.work..107S

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