Electron-proton collisions in plasma on magnetic white dwarfs

Details Electron-proton collisions in plasma on magnetic white dwarfs Electron-proton collisions in plasma on magnetic white dwarfs

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..437z&link_type=abstract

Astronomy Letters, Volume 25, Issue 7, July 1999, pp.437-444

Astronomy and Astrophysics

Astronomy

12

Scientific paper

We analyze the motion of an electron in a strong, uniform magnetic field and in the Coulomb electric field of a proton in the case where the electron gyroradius is smaller than the maximum impact parameter e^2/kT, which corresponds to collisions with a large-angle scattering in the absence of a magnetic field. A new expression is derived for the effective frequency nueff of electron-proton collisions in a classical plasma. The standard relations for nueff are shown to be invalid in this case, which, in particular, can be realized in the photospheres of magnetic white dwarfs. This factor plays an important role in calculations of the radiative transfer and the radiation pressure force in the photospheres of these stars.

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