[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.
Disciplines :
Space science, astronomy & astrophysics
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 - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) - Sciences spatiales
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Language :
English
Title :
The young open cluster NGC 6231: five years of investigations
Publication date :
01 November 2005
Audience :
International
Main work title :
Massive Stars and High-Energy Emission in OB Associations
