Three-Dimensional Structured Shocks in Am-Herculis Type Systems - Part One - the Angular Dependence of Intensity and Polarization from Axisymmetric Shocks

Details Three-Dimensional Structured Shocks in Am-Herculis Type Systems - Part One - the Angular Dependence of Intensity and Polarization from Axisymmetric Shocks Three-Dimensional Structured Shocks in Am-Herculis Type Systems - Part One - the Angular Dependence of Intensity and Polarization from Axisymmetric Shocks

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.246..686w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 246, NO.4/OCT15, P. 686, 1990

Astronomy and Astrophysics

Astronomy

19

Scientific paper

We present calculations of the wavelength and angular dependence of intensity and circular polarization of cyclotron emission from axisymmetric accretion shocks in a uniform magnetic field using three-dimensional post-shock structures that we compute in a self-consistent manner including bremsstrahlung and cyclotron cooling. For the assumed fixed mass (0.5 Msun) and magnetic field (20 MG) the post-shock structure is determined by the variation of the specific accretion rate away from the axis of symmetry. We discuss three models corresponding to different accretion-rate variation with post-shock structures that range from being mainly bremsstrahlung-cooling dominated to cyclotron-cooling dominated. The angular dependence of intensity and circular polarization is found to be a sensitive function of the post-shock structure, particularly at marginally optically thick and optically thick frequencies. We use our results to discuss, in general terms, multiwaveband phase-dependent intensity and circular polarization observations of AM Herculis-type systems and present the first model for V834 Cen (E1405 - 451) which fits phase-dependent observations in V-, J- and H-bands simultaneously.

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