The hard X-ray eclipse in the intermediate polar EX Hydrae

Details The hard X-ray eclipse in the intermediate polar EX Hydrae The hard X-ray eclipse in the intermediate polar EX Hydrae

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8811582b&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Cataclysmic Variables, Eclipsing Binary Stars, X Ray Astronomy, Photons, Stellar Radiation, Stellar Rotation

Scientific paper

The partial hard X-ray eclipse in EX Hydrae is shown to vary in depth with the 67 min rotation period of the accreting magnetic white dwarf and with photon energy. The eclipse is deeper at 67 min maximum than at minimum reaching the same residual flux in both cases. Averaged over 67 min phase, the fractional eclipse depths are 31 and 42 percent in the 1.6 to 3.6 ke V and 3.6 to 7.4 ke V range, respectively. It is suggested that X-ray emission is observed from both poles of the white dwarf and that the partial eclipse is due to the lower pole being eclipsed while the upper escapes eclipse.

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