Abstract
We consider the problem of cyclotron line formation in a magnetic field of approx.5 x 10/sup 12/ gauss in the accretion column of a system such as Her X-1. Using a simple model for heating by the accreting matter, we solve a kinetic equation for the electron velocity distribution including terms for Coulomb collisions betwen thermal particles, and line and continuum emission. Significasnt departures from a Maxwellian distribution result in a lower line emissivity and reduced Doppler broadening of the line. The requirement of thermal stability of the atmosphere provides a range of allowed temperatures for the line emitting region. Our results will be subject to modification when the effects of radiative transfer and radiation pressure are included.
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