GINGA X-ray observation of EX Hya - New constraints on the accretion model

Details GINGA X-ray observation of EX Hya - New constraints on the accretion model GINGA X-ray observation of EX Hya - New constraints on the accretion model

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..417r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 417-429. Royal Society-supported

Astronomy and Astrophysics

Astronomy

36

Accretion Disks, Cataclysmic Variables, Companion Stars, Eclipsing Binary Stars, Ginga Satellite, Spaceborne Astronomy, Exosat Satellite, Light Curve, Periodic Variations, Stellar Magnetic Fields, Temporal Distribution

Scientific paper

The results of a Ginga X-ray observation of the eclipsing intermediate polar system EX Hya are presented. These new data probe the characteristics of the 67-min modulation and the 98-min orbital eclipses at higher energies than was possible with Exosat. The average fractional depth of the X-ray eclipse goes up with increasing X-ray energy between 1.5 and 4 keV. Above 4 keV, the fractional eclipse depth is consistent with a constant level of 40-50 percent. Conversely, the pulse fraction of the rotational modulation decreases with increasing X-ray energy in the 1.5-6 keV range, but tends to a constant value of about 9-10 percent at energies above 6 keV; the modulation is significantly detected at energies up to at least 15 keV. There is a correlation between the depth of the individual eclipses and the local out-of-eclipse flux at energies below 4.5 keV. Current models for EX Hya are reviewed in the context of these new constraints.

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