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Soft X-ray emission of VY Sculptoris stars during optical high state
Received 27 April 1998 / Accepted 13 May 1998
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
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Online publication: July 20, 1998