The HEAO-A2 soft X-ray survey of dwarf novae in outburst

Details The HEAO-A2 soft X-ray survey of dwarf novae in outburst The HEAO-A2 soft X-ray survey of dwarf novae in outburst

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190...87c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 190, Jan. 1980, p. 87-97.

Astronomy and Astrophysics

Astronomy

19

Dwarf Stars, Novae, Spaceborne Astronomy, Stellar Radiation, X Ray Astronomy, Brightness Temperature, Bursts, Gas Density, Heao 1, Hydrogen, Light Curve, Ultraviolet Spectra, X Ray Spectra

Scientific paper

Although HEAO-1 scanned 19 dwarf novae while they were undergoing optical outbursts, soft X-ray emission (0.18-0.43 keV) was detected only from SS Cygni and U Geminorum. The 3-sigma upper limits to the flux from nondetected objects are presented, which range from 1 to 10 percent of U Gem's mean flux. In addition, hypotheses for the failure to detect soft X-rays from the majority of the dwarf novae are discussed, including interstellar absorption, source variability, and the spottiness of the X-ray coverage. It is concluded that most dwarf novae are not observed as soft X-ray sources by virtue of low temperatures (less than approximately 100,000 K) or greater absorption.

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