Cyclotron emission from inhomogeneous shocks in AM Herculis-type systems

Details Cyclotron emission from inhomogeneous shocks in AM Herculis-type systems Cyclotron emission from inhomogeneous shocks in AM Herculis-type systems

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..412w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. 412-421.

Astronomy and Astrophysics

Astrophysics

40

Binary Stars, Cyclotron Radiation, Magnetic Stars, Shock Waves, White Dwarf Stars, High Temperature Plasmas, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Temperature

Scientific paper

The properties of cyclotron radiation from accretion shocks located above the atmospheres of magnetic white dwarfs are discussed, taking into account the effects of field spread, density and temperature structure, and geometrical extension. The models are an improvement on previous point-source models and have characteristics that are in better overall agreement with the properties of AM Herculis-type systems. The flat energy distributions seen in some AM Her-type systems are readily explained in terms of a model in which the optical depth parameter varies across the emission region in response to differences in the accretion rate. The lack of harmonic structure in the intensity spectra of most AM Her-type systems is probably a consequence of field spread in an extended emission region. It is also shown that the asymmetries seen in phase-dependent polarization curves can be explained when allowance is made for the displacement of emission regions from the poles.

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