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Astron. Astrophys. 336, 626-636 (1998)

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Soft X-ray emission of VY Sculptoris stars during optical high state

J. Greiner

Astropysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Received 27 April 1998 / Accepted 13 May 1998

Abstract

I have collected all available ROSAT observations of VY Scl stars including those during the all-sky survey to investigate the presence, strength and spectrum of soft X-ray emission (0.1-2.4 keV) of this group of nova-like variables. A total of 9 out of the 14 VY Scl stars are detected with ROSAT, mostly during optical high states. Interestingly, all detections during the optical high state have very similar X-ray spectral characteristics. I find that a simple blackbody model gives a reasonably good fit in all cases, with temperatures falling in the narrow range between 0.25-0.5 keV. Possible emission mechanisms are discussed.

Key words: accretion, accretion disks – instabilities – X-rays: stars – stars: novae, cataclysmic variables

Send offprint requests to: J. Greiner, (jgreiner@aip.de)

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© European Southern Observatory (ESO) 1998

Online publication: July 20, 1998
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