Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..867w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 15, 1987, p. 867-878. SERC-supported research
Astronomy and Astrophysics
Astronomy
26
Flicker, Magnetic Stars, Radiant Flux Density, Visible Spectrum, White Dwarf Stars, X Ray Spectra, Constraints, Exosat Satellite, Spectral Correlation, Spectrum Analysis, Stellar Models
Scientific paper
A study of the short-time-scale variability of the polar system EF Eri is presented based on simultaneous hard and soft X-ray monitoring with the Exosat Observatory and optical photometry from CTIO. The observations are used to investigate the nature of the flickering in this system, and the correlations between the variability in the three bands. The hard X-ray flickering is characterized by a quasi-periodic 10-percent modulation at about 230 sec. The soft X-ray and optical flickering have higher amplitudes but, in contrast, lack any dominant time-scales. A significant degree of correlation exists between the flickering in all three bands. The correlation between the hard X-ray and optical flickering is very strong, while that between the hard and soft X-rays is much lower. The implications of these results for the origin of the different spectral components, and the constraints that they place on models of the polecap emission region, are discussed.
King Andrew R.
Watson Michael G.
Williams Anthony G.
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