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P103 |
November 2005
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To be published in:
JENAM2005 Proceedings
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The young open cluster NGC 6231: five years of investigations.+
H. Sana1,*,
G. Rauw1,** and
E. Gosset1,**
1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium
* Research Fellow FNRS, Belgium
** Research Associate FNRS, Belgium
+ Based on observations collected at the European Southern Observatory (La Silla, Chile) and with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member states and the USA (NASA).
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 LX - Lbol 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.
Article: |
jenam_ngc6231.pdf |
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