Stellar oscillations in the presence of a magnetic field

Details Stellar oscillations in the presence of a magnetic field Stellar oscillations in the presence of a magnetic field

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..577c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 1, 1986, p. 577-591.

Astronomy and Astrophysics

Astronomy

23

A Stars, Magnetic Stars, Magnetohydrodynamic Waves, Stellar Magnetic Fields, Stellar Models, Stellar Oscillations, Boundary Value Problems, Propagation Modes, Wave Propagation

Scientific paper

The authors investigate the problem of stellar pulsation in the presence of a magnetic field, for arbitrary frequencies and horizontal wavenumbers. Magnetic effects are strong in a boundary layer close to the stellar surface, but it is possible to identify independent Alfvénic-type modes at sufficient stellar depth. They show how the boundary layer solutions can be matched to the interior solutions for a range of horizontal wavenumbers, this range increasing with frequency. The authors calculate the energy flux carried by the Alfvénic modes and show that the loss of pulsational energy via these waves is significant, this being especially so for high horizontal wavenumbers. Their results are of particular interest to observations of pulsating magnetic Ap stars.

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