Short time-scale X-ray variability in the AM Her-type binary EF Eridani.
Abstract
ROSAT Position-Sensitive Proportional Counter (PSPC) observations of the AM Her-type binary EF Eri are presented. In the PSPC spectrum the hard-X-ray bremsstrahlung component and the soft-X-ray quasi-blackbody component are clearly separated. Study of the short-time-scale variability of both components shows the almost complete absence of quasi-periodic oscillations in the few-minute range, large-amplitude aperiodic soft-X-ray flaring, and zero correlation at zero-time-lag between fluctuations in both bands. Also discussed are the origin of the soft X-rays and the implications in terms of current accretion models.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1991
- Bibcode:
- 1991A&A...246L..36B
- Keywords:
-
- Cataclysmic Variables;
- Stellar Radiation;
- White Dwarf Stars;
- X Ray Binaries;
- X Ray Spectra;
- Bremsstrahlung;
- Light Curve;
- Proportional Counters;
- Rosat Mission;
- Temporal Distribution;
- Astrophysics