Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...6e..16s&link_type=abstract
Neutron Stars and Black Holes in Star Clusters, 26th meeting of the IAU, Joint Discussion 6, 17-18 August 2006, Prague, Czech Re
Computer Science
Scientific paper
Globular clusters are believed to contain a large number of interacting binaries which are thought to delay the ineluctable core collapse of these high-density clusters. However over-crowding in the optical domain makes their detection difficult, and the nature of this population is largely unknown. Using X-rays, it is possible to detect most of the interacting binaries and their products such as low mass X-ray binaries often in quiescence, cataclysmic variables and millisecond pulsars, as well as active binaries. Then a multi wavelength is needed in order to clearly identify the faint X-ray sources. We present an analysis of the globular cluster NGC 2808 using a 42ks XMM-Newton observation. We show that at least seven X-ray sources are associated with the cluster, and show evidence that these are indeed interacting binaries. The brightest source C1 in the innermost region has X-ray emission characteristic of a cataclysmic variable for which we have possibly detected the spin period of the white dwarf. The X-ray data is complemented by the result of a study in ultra-violet which identifies three cataclysmic variable candidates. Two of them are consistent with the position and the properties of our X-ray sources, including the source C1. Moreover, we have detected one of the couple of quiescent low mass X-ray binary we expect to find in this cluster. NGC 2808 is one of the most massive and concentrated globular clusters of our Galaxy. Previous studies in optical showed that the structure of this cluster is complex and it may be composed of several generations of stars. In the same way, we observe a possible anomaly of the X-ray source distribution around the cluster.
Servillat Mathieu
Webb Natalie A.
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