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Astron. Astrophys. 346, 146-150 (1999)

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X-ray observations through the outburst cycle of the dwarf nova YZ Cnc

Frank Verbunt 1, Peter J. Wheatley 2 and Janet A. Mattei 3

1 Astronomical Institute, P.O. Box 80000, 3508 TA Utrecht, The Netherlands
2 Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
3 American Association of Variable Star Observers, 25 Birch Street, Cambridge MA 02138-1205, USA

Received 3 February 1999 / Accepted 4 March 1999

Abstract

We have observed YZ Cnc at two day intervals from 6 to 24 April 1998, covering two full outburst cycles. The 0.1-2.4 keV flux is lower during optical outburst than in quiescence, and lowest at the end of the outburst. The decline of the X-ray flux in the quiescent interval appears to be in contrast to prediction of simple models for accretion-disk instabilities. Variability on [FORMULA]hour time scales is present, but appears not related to the orbital phase. YZ Cnc was less luminous in X-rays during our 1998 observations than in earlier ROSAT observations.

Key words: accretion, accretion disks – stars: individual: YZ Cnc – stars: novae, cataclysmic variables

Send offprint requests to: Frank Verbunt (verbunt@phys.uu.nl)

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© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999
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