The HEAO-A2 soft X-ray survey of cataclysmic variable stars - EX Hydrae during optical quiescence

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Stars, Light Curve, Novae, Spaceborne Astronomy, Variable Stars, X Ray Sources, Curve Fitting, Heao 1, Luminous Intensity, Optical Activity, X Ray Stars

Scientific paper

Results are reported for HEAO A2 soft X-ray (below 2 keV) scanning observations of the southern dwarf nova EX Hya. An X-ray light curve is presented which shows no apparent orbital modulation. The best-fitting spectral parameters are derived for the source, and the observations are compared with the spectral behavior of the dwarf nova SS Cyg during optical quiescence. The results are discussed in terms of models for X-ray production by accreting white dwarfs.

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