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

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..128b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 128-131.

Astronomy and Astrophysics

Astrophysics

24

Cataclysmic Variables, Eclipsing Binary Stars, Emission Spectra, Stellar Spectrophotometry, White Dwarf Stars, X Ray Spectra, Accretion Disks, Light Curve, Stellar Magnetic Fields, Stellar Mass Accretion

Scientific paper

The partial hard X-ray eclipse in EX Hydrae reported earlier is shown to vary in depth both with the 67-min rotation period of the accreting magnetic white dwarf and with photon energy. The eclipse is deeper at the 67-min maximum than at the minimum, reaching the same residual flux in both cases. Averaged over a 67-min phase, the fractional eclipse depths are 31% and 42% in the 1.6 - 3.6 keV and 3.6 - 7.4 keV range, respectively. The authors suggest 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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