Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..97..229z&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 97, no. 2, Dec. 1983, p. 229-259.
Astronomy and Astrophysics
Astrophysics
19
High Temperature Plasmas, Magnetic Stars, Plasma-Electromagnetic Interaction, Stellar Radiation, White Dwarf Stars, Absorptivity, Collisionless Plasmas, Emissivity, Gyrofrequency, Radiative Transfer, Temperature Distribution
Scientific paper
The influence of radiation on the electron velocity distribution in a hot nonrelativistic plasma localized near the surface of magnetic white dwarfs is investigated. The part played by the plasma in the formation of cyclotron features in the optical spectrum of these stars is studied. The region of parameters where the transverse temperature of plasma is defined by the brightness temperature of extraordinary radiation at the gyrofrequency is found. When escaping from the plasma in a homogeneous magnetic field, this component forms a cyclotron line in absorption. The ordinary radiation at the gyrofrequency and both modes at higher cyclotron harmonics are in emission or absorption depending on the magnetic field strength and hot plasma density. Possible interpretation of the observed spectral features of magnetic white dwarfs in terms of the developed theory is discussed.
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