Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..221k&link_type=abstract
(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie
Astronomy and Astrophysics
Astronomy
21
Eclipsing Binary Stars, Emission Spectra, Light Curve, Variable Stars, X Ray Sources, Periodic Variations, Radiant Flux Density, Stellar Luminosity, Stellar Models, Stellar Rotation, Stellar Temperature, Visual Observation, X Ray Spectra
Scientific paper
The cataclysmic variable EX Hydrae has been observed in X-rays with Einstein Observatory. A 67 min periodic X-ray modulation has been found in the energy range 0.1-2 keV, whereas the source is approximately constant above 2 keV. The modulation is approximately in phase with the stable 47 min modulation in the optical brightness. The X-ray spectrum changes slightly with the 67 min phase but is consistent with a two-component model with constant temperature only changing in relative intensity. Quasi-simultaneous optical observations were also obtained and used to extend the time base of the optical modulation. The result is indicative of a decrease in the 67 min period on a time scale of 3 million yr. The implications for the hypothesis of a nonuniform rotating white dwarf as the origin of the 67 min optical and X-ray modulation are discussed.
Bakker R.
Chlebowski Tomasz
Dijk van W.
Heise Jaret
Kruszewski Adrian
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