Thermal emission of an optically thick plasma containing a strong magnetic field

Details Thermal emission of an optically thick plasma containing a strong magnetic field Thermal emission of an optically thick plasma containing a strong magnetic field

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978sva....22..214p&link_type=abstract

(Astronomicheskii Zhurnal, vol. 55, Mar.-Apr. 1978, p. 373-389.) Soviet Astronomy, vol. 22, Mar.-Apr. 1978, p. 214-222. Transla

Astronomy and Astrophysics

Astronomy

14

Plasma Radiation, Pulsars, Stellar Magnetic Fields, Thermal Radiation, White Dwarf Stars, X Ray Sources, Diffusion Waves, Ion Cyclotron Radiation, Optical Thickness, Photons, Photosphere, Plasma Density, Polarization Characteristics, Radiative Transfer

Scientific paper

Intensity and polarization spectra are obtained along with a directivity pattern for radiation from a photosphere which contains a strong magnetic field and in which free-free transitions predominate. Some observational effects resulting from the presence of a photospheric magnetic field are discussed, including cyclotron resonances in the spectra, frequency-dependent narrowing of the directivity pattern, change in the sign of circular polarization, and an abrupt change in the position angle of linear polarization at certain frequencies. The results obtained are used to interpret observations of hot magnetic white dwarfs. It is shown that many of the qualitative effects can also be observed in the radiation from a much larger class of objects with strong magnetic fields and that, in particular, the photon-energy dependence of directivity-pattern width may be exhibited in pulsar X radiation. It is noted that the linear polarization observed for several white dwarfs can be explained without hypothesizing the existence of stellar coronae containing very strong magnetic fields.

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