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Astronomy & Astrophysics

An XMM-Newton observation of the very young open cluster NGC 6383 +

G. Rauw1,*, M. De Becker1, E. Gosset1,*, J.M. Pittard2 and I.R. Stevens3

1 Institut d'Astrophysique et de Géophysique - Université de Liège, Allée du 6 Août, Bât B5c, B-4000 Liège (Sart Tilman), Belgium
2 Department of Physics & Astronomy, University of Leeds, Leeds LS2 9JT, UK
3 School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

* Research Associate FNRS, Belgium

+ Based on observations with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA member states and the USA (NASA).


     We report the detection of a number of X-ray sources associated with the very young open cluster NGC 6383. About two thirds of these objects are correlated with a rather faint optical source and all but one have at least one infrared counterpart within a correlation radius of 8 arcsec. Although NGC 6383 is not associated with a prominent star forming region, the overall properties of many of the X-ray sources suggest that they may be candidates for low-mass pre-main sequence stars. The number of X-ray sources increases towards the cluster center suggesting that there exists a close relation between the massive O-star binary system HD 159176 in the cluster core and the population of X-ray bright low-mass objects in NGC 6383.

Key Words
Stars: pre-main sequence -- X-rays: stars -- open clusters and associations: individual: NGC 6383 -- Stars: early-type

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