Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-01-14
Astronomy and Astrophysics
Astrophysics
8 pages, 9 figures, to appear in "Highlights in X-ray Astronomy", proceedings of the workshop in honour of Joachim Truemper's
Scientific paper
Two new bright X-ray sources in globular clusters, and many less luminous ones in globular clusters and in old open clusters, have been discovered with ROSAT. Accurate positions obtained with ROSAT help identification with optical objects, which however is still very incomplete in globular clusters. One dim globular cluster source has been identified with a recycled radio pulsar; several others may be cataclysmic variables. The four brightest X-ray sources identified in the old open cluster M67 are puzzling, as we do not understand why they emit X-rays. In comparison with the two old open clusters studied so far, globular clusters are remarkably underluminous in X-rays.
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