X-rays from old star clusters
Abstract
Description
A brief overview is given of X-ray observations of old clusters. Most X-ray sources in old open clusters are interacting binaries, formed via evolution of a primordial binary, and emitting X-rays because of magnetic activity; however, a sizable fraction of the cluster sources is not well understood, including some of the most luminous ones. Globular clusters appear to contain fewer magnetically active X-ray sources than expected if one scales from old open clusters by mass.
10 pages, 6 figures, to be published in: Stellar clusters and associations: Convection, Rotation, and Dynamos, ed. R. Pallavicini, ASP Conf. Ser
10 pages, 6 figures, to be published in: Stellar clusters and associations: Convection, Rotation, and Dynamos, ed. R. Pallavicini, ASP Conf. Ser