Cyclotron absorption in accreting magnetic white dwarfs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Magnetic Stars, Stellar Mass Accretion, White Dwarf Stars, Binary Stars, Cyclotron Frequency, Stellar Rotation

Scientific paper

The cyclotron absorption coefficient is calculated using a three-dimensional Maxwellian distribution for the electrons for a wide range of temperatures and frequencies. Numerical fits are presented and compared with previous results, whose range of validity is clarified. The results are applied to a plasma slab which is perpendicular to the magnetic field, and it is shown that there are deviations from the Rayleigh-Jeans spectrum predicted in earlier works. Comparison with observations for AM Herculis suggests that its magnetic field is about 50-million gauss (or less).

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