The hard X-ray eclipse in the intermediate polar EX Hydrae.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1988
- Bibcode:
- 1988A&A...189..128B
- Keywords:
-
- 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;
- Astrophysics