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Astron. Astrophys. 327, 602-613 (1997)

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Cataclysmic variables in the ROSAT PSPC All Sky Survey

F. Verbunt 1, 2, W.H. Bunk 2, H. Ritter 3 and E. Pfeffermann 2

1 Astronomical Institute, P.O.Box 80000, 3508 TA Utrecht, The Netherlands
2 Max Planck Institut für extraterrestrische Physik, D-85740 Garching bei München, Germany
3 Max Planck Institut für Astrophysik, D-85740 Garching bei München, Germany

Received 20 February 1997 / Accepted 29 April 1997

Abstract

91 cataclysmic variables from a sample of 162 systems with known or suspected binary periods were detected during the ROSAT XRT-PSPC All Sky Survey. Among the non-magnetic systems, the X-ray to optical/ultraviolet flux ratio decreases along the sequence SU UMa type - U Gem type - Z Cam type - UX UMa type, due mainly to variations in the optical/ultraviolet flux. 8 of the 10 brightest systems in terms of total PSPC countrate are magnetic systems. The 0.5-2.5 keV X-ray luminosities range up to [FORMULA] erg/s, the highest luminosities being those of four faraway DQ Her type systems. The other types of cataclysmic variables all have similar 0.5-2.5 keV luminosity distributions. In an Appendix we compare the X-ray properties of cataclysmic variables with those of the dim X-ray sources in globular clusters.

Key words: cataclysmic variables – globular clusters – X-rays: stars

Send offprint requests to: F. Verbunt, Utrecht

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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998
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