Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.206..879c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 206, Feb. 15, 1984, p. 879-897. Research sponsored by t
Astronomy and Astrophysics
Astronomy
104
Binary Stars, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, X Ray Spectra, Dwarf Novae, Radiant Flux Density, Spectral Energy Distribution, Stellar Luminosity
Scientific paper
This paper presents the results of an X-ray survey of 31 known or suspected cataclysmic variables. Eighteen of these close binary systems are detected with inferred luminosities in the 0.1 - 4.0 keV band of between 1030 and 1032erg s-1. The majority have relatively hard X-ray spectra (kT > 2 keV) irrespective of luminosity state. Of seven dwarf novae observed during optical outbursts only U Gem exhibited enhanced ultrasoft X-ray emission (kT ≡ 10 eV) in addition to weak, hard X-ray emission. Variability of the X-ray flux is observed in many of these stars, on time-scales ranging from tens of seconds to hours. The contribution to the flux from extended X-ray emission is investigated for SU UMa and GK Per. Several possibilities for the origin of the hard X-rays are considered.
Cordova France A.
Mason Keith O.
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