ROSAT detection of stellar X-ray sources in the old open cluster M 67

Details ROSAT detection of stellar X-ray sources in the old open cluster M 67 ROSAT detection of stellar X-ray sources in the old open cluster M 67

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..175b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 175-180.

Astronomy and Astrophysics

Astrophysics

41

Open Clusters, Rosat Mission, X Ray Sources, X Ray Stars, Cataclysmic Variables, Stellar Orbits

Scientific paper

We have obtained a deep pointing on the old open cluster M 67 with the ROSAT PSPC. The detected X-ray sources show a strong concentration towards the optical cluster which leads us to believe that most of the sources are actually associated with M 67. In particular, our observation shows an X-ray counterpart for the cataclysmic variable recently discovered in M 67. Further, a larger fraction of the X-ray sources identified with M 67 cluster members are binaries as determined from optical studies, and we show that the X-ray properties of these stars make them good candidates for RS CVn systems in M 67.

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