X-rays from old open clusters.

Details X-rays from old open clusters. X-rays from old open clusters.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc...23b&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 23 - 24

Astronomy and Astrophysics

Astrophysics

Open Clusters: X Rays, Open Clusters: Binaries, Open Clusters: White Dwarfs, Open Clusters: Blue Stragglers

Scientific paper

The authors observed with ROSAT a sample of old open clusters. They present the results on M67, NGC 752 and NGC 188, and compare their X-ray properties. Both in M67 and in NGC 752 they detect close, circularized binaries, that emit X-rays due to chromospheric activity. They also detect one blue straggler in each cluster, and in M67 also a magnetic cataclysmic variable and a single, hot white dwarf. Surprisingly, they also detect some long-period, eccentric binaries.

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