Cyclotron spectra from inhomogeneous accretion columns

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion Disks, Binary Stars, Cataclysmic Variables, Cyclotron Radiation, Main Sequence Stars, White Dwarf Stars, Cosmic Plasma, Electron Density Profiles, Interstellar Magnetic Fields, Radiative Transfer, Stellar Cores, Stellar Rotation, X Ray Sources

Scientific paper

The cyclotron emission from infinite plasma cylinders with uniform magnetic fields, and temperatures, but with a variety of axially symmetric electron density profiles, is calculated. Such inhomogeneous plasmas are shown to be able to produce relatively flat spectra which cannot be produced by homogeneous models. Fits to the optical and infrared continua of the AM Herculis systems ST LMi, V834 Cen, and EF Eri are presented. For ST LMi and V834 Cen, good fits are obtained using a two-core model in which a dense inner cylindrical core with a temperature of 10 keV produces most of the observed X-rays, and both this core and the less dense outer shell produce the optical continuum. For EF Eri, the corresponding temperature is about 15 keV. The average value of the dimensionless plasma parameter Lambda is about 10 to the 6th - 10 to the 7th.

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