Short time-scale X-ray variability in the AM Her-type binary EF Eridani

Details Short time-scale X-ray variability in the AM Her-type binary EF Eridani Short time-scale X-ray variability in the AM Her-type binary EF Eridani

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..36b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. L36-L39.

Astronomy and Astrophysics

Astrophysics

16

Cataclysmic Variables, Stellar Radiation, White Dwarf Stars, X Ray Binaries, X Ray Spectra, Bremsstrahlung, Light Curve, Proportional Counters, Rosat Mission, Temporal Distribution

Scientific paper

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.

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