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19942023
most citedA Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35

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astro-ph1998

X rays from old open clusters: M 67 and NGC 188

T. Belloni, F. Verbunt, R. D. Mathieu

We have observed the old open clusters M 67 and NGC 188 with the ROSAT PSPC. In M 67 we detect a variety of X-ray sources. The X-ray emission by a cataclysmic variable, a single ho…