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eJAAVSO

Highlights from the HEAO-1 Survey of Cataclysmic Variable Stars

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Frances Córdova

California Institute of Technology, Pasadena, California 91125

 

Abstract

 

A survey of the x-ray properties of ~150 cataclysmic variable stars was conducted using the High Energy Astronomical Observatory, HEAO-1. U Geminorum was discovered to be emitting an intense soft x-ray flux and a weak hard x-ray flux during an optical outburst. Hard x-ray flickering was discovered from SS Cygni during optical quiescence. EX Hydrae and possibly AY Lyrae were detected in the soft x-ray while in their quiescent states. Most of the cataclysmic variables evidenced no x-ray emission, including ~20 dwarf novae which were observed by HEAO-1 during optical outbursts. Finally, soft x-ray pulsations were discovered from SS Cyg and U Gem. Simultaneous visual coverage was provided chiefly by the American Association of Variable Star Observers (AAVSO) and the Royal Astronomical Society of New Zealand Variable Star Section (VSS).

 

Link to ADS abstract, article and citation information

 
 
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