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Astron. Astrophys. 327, 602-613

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Cataclysmic variables in the ROSAT PSPC All Sky Survey

F. Verbunt1,2, W.H. Bunk2, H. Ritter3, and E. Pfeffermann2

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

Received 20 February 1997 / Accepted 29 April 1997


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 0.5-2.5keV X-ray luminosities range up to FORMULAerg/s, the highest luminosities being those of four faraway DQ Her type systems. The other types of cataclysmic variables all have similar 0.5-2.5keV 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

© European Southern Observatory (ESO) 1997

Online publication: October 14, 1997
Last change: April 6, 1998