Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196....1c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, July 1981, p. 1-12. Research supported by the U.S. Department of E
Astronomy and Astrophysics
Astronomy
47
Dwarf Novae, Heao 1, Novae, Variable Stars, X Ray Astronomy, Dwarf Stars, Stellar Luminosity, X Ray Sources
Scientific paper
A survey of the soft X-ray emission from 206 cataclysmic variable stars, including dwarf novae in optically quiescent states, classical novae, recurrent novae, nova-like objects and polars, is reported. This is an extension of a previous survey of dwarf novae in outbursts by Cordova et al. (1980). The number of surveyed stars that correspond to features greater than 2 sigma is not in excess of the number of chance coincidences expected on the basis of a random sample of positions distributed over the entire sky. While a few cataclysmic variables have been previously identified as X-ray sources, the results of this survey imply that cataclysmic variables as a class must be, at best, low-luminosity X-ray sources with fluxes below the HEAO-1 A2 detector's sensitivity limit of a few times 10 to the -11th erg/sq cm-s in the energy range 0.1-3 keV. The X-ray luminosities of the cataclysmic variables are consistent with predictions from disk accretion models, provided that a wide range of accretion rates apply.
Cordova France A.
Jensen Keld A.
Nugent J. J.
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