Theoretical Stokes profiles for magnetic stars. I - Rotation, line asymmetries and crossover

Details Theoretical Stokes profiles for magnetic stars. I - Rotation, line asymmetries and crossover Theoretical Stokes profiles for magnetic stars. I - Rotation, line asymmetries and crossover

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217...55s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 1, 1985, p. 55-68.

Statistics

Applications

10

Absorption Spectra, Line Spectra, Magnetic Stars, Stellar Magnetic Fields, Stellar Rotation, Stellar Spectra, A Stars, Magnetic Dipoles, Oscillator Strengths, Radial Velocity, Stellar Models, Stokes Law Of Radiation, Zeeman Effect

Scientific paper

A discussion of theoretical absorption line Stokes profiles of magnetic stars, within the framework of the rigid rotator model, is presented. These calculations reveal the occurrence of asymmetric absorption line profiles in the Stokes I parameter at certain phases of the magnetic cycle, confirming and extending Borra's (1974) results. This effect results from the combination of a dipolar magnetic field structure and moderate rotational velocities, and is shown to be closely related to the well-known crossover effect. Theoretical line profiles calculated for a large number of combinations of excentric dipole models, magnetic field strengths, phases, rotational velocities, oscillator strengths and atomic transitions are then investigated, in order to determine the changes in asymmetry and degree of crossover as a function of these parameters. Finally, possible applications of the absorption line asymmetries to the determination of stellar magnetic fields are noted.

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