X-ray sources in Galactic old Open Star Clusters
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| Publication date | 2013 |
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| Book title | 370 Years of Astronomy in Utrecht |
| Book subtitle | proceedings of a conference held at Hotel Leeuwenhorst, Noordwijkerhout, the Netherlands, 2-5 April 2012 |
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| Series | Astronomical Society of the Pacific conference series |
| Event | 370 Years of Astronomy in Utrecht |
| Pages (from-to) | 251-261 |
| Publisher | San Francisco: Astronomical Society of the Pacific |
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| Abstract |
I review the current status of studies of the X-ray sources in Galactic old open clusters. Cataclysmic variables (CVs), magnetically-active binaries (ABs), and sub-subgiants (SSGs) dominate the X-ray emission of old open clusters. Surprisingly, the number of ABs detected inside the half-mass radius with LX ≥ 1 × 1030 erg s-1 (0.3-7 keV) does not appear to scale with cluster mass. Comparison of the numbers of CVs, ABs, and SSGs per unit mass in old open and globular clusters shows that each of these classes is under-abundant in globulars. This suggests that dense environments suppress the frequency of even some of the hardest binaries.
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| Document type | Conference contribution |
| Language | English |
| Published at | http://aspbooks.org/a/volumes/article_details/?paper_id=35352 |
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