Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715231g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #152.31; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first study of the X-ray population of the intermediate-age rich open cluster NGC 6819 using the XMM-Newton Observatory. In the past decade, Chandra X-ray observations have shown a relationship between the X-ray population of globular clusters and their internal dynamics and encounter frequency. We investigate whether a similar link exists in open clusters, utilizing X-ray and UV data from XMM-Newton observations of eight rich open clusters, along with the wealth of photometry and radial velocity data from the WIYN Open Cluster Study (WOCS) and the CFHT Open Cluster Study. These results on NGC 6819 are the first of our investigation. Within the cluster apparent diameter, we detect 11 sources in NGC 6819 down to a luminosity of 1030 ergs/s for cluster members. Sources are classified by taking into account their broadband X-ray/UV/optical spectral properties. We gratefully acknowledge support from XMM grant NNX08AY27G from the National Aeronautics and Space Administration.
Frinchaboy Peter
Geller Aaron M.
Gosnell Natalie M.
Kalirai Jason S.
Mathieu Robert D.
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