Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256...80a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 1, May 1, 1992, p. 80-96.
Other
14
Accretion Disks, Blue Stars, Eclipsing Binary Stars, Variable Stars, White Dwarf Stars, Cyclotron Radiation, Emission Spectra, Halos, Line Spectra, Magnetic Stars, Stellar Models, Zeeman Effect
Scientific paper
Previous phase-resolved spectropolarimetric observations of the AM Herculis systems V834 Centauri (E1405-451) and EF Eridani have shown broad, Zeeman-shifted absorption features during the bright phases. These features are thought to be nonphotospheric in origin, and to arise from a cool 'halo' of unshocked gas surrounding the accretion shock on the surface of the white dwarf primary. Preliminary models for the accretion halo region are presented and these models are used to perform a more detailed analysis of the relevant data for these two systems than has previously been done. To explain the observed halo Zeeman features, geometries which are consistent with the presence of linearly extended cyclotron emission regions are required. Such regions have previously been deduced from different considerations by other investigators. The estimated masses for the accretion halo are comparable to the mass of the cyclotron emission region.
Achilleos Nicholas
Wickramasinghe Dayal T.
Wu Kinwah
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