Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..417c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Oct. 1, 1988, p. 417-436.
Astronomy and Astrophysics
Astronomy
9
Polarized Light, Stellar Magnetic Fields, Thomson Scattering, Weak Energy Interactions, White Dwarf Stars, Giant Stars, Main Sequence Stars, Radiative Transfer
Scientific paper
A classical development of the scattering of the Stokes parameters that characterize an arbitrarily polarized light beam by electrons located in a magnetic field is presented. The magnetic field is considered to be "weak" in the sense that the formulae developed are accurate for frequencies greater than the gyro-frequency. For optical wavelengths, this implies a magnetic field <108G. Thus, the radiative transfer theory developed should be applicable to all main-sequence and giant stars and most white dwarfs for the optical part of the spectrum. The atmospheric geometry is that of a plane-parallel atmosphere and the full angular dependence of the source functions is included for a magnetic field having an arbitrary orientation to the atmosphere. While the geometrical development of the scattering matrix assumes a pure scattering atmosphere, the results are generalized to the non-gray case. Formulae for the approximate degree of polarization and its wavelength dependence are given.
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