Magnetic overstability as an excitation mechanism of the rapid oscillations of AP stars

Details Magnetic overstability as an excitation mechanism of the rapid oscillations of AP stars Magnetic overstability as an excitation mechanism of the rapid oscillations of AP stars

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275l...5s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. L5-L9.

Astronomy and Astrophysics

Astrophysics

58

A Stars, Magnetic Stars, Peculiar Stars, Stellar Oscillations, Variable Stars, Polar Regions, Stellar Luminosity, Stellar Temperature

Scientific paper

Magnetic overstability is proposed as an excitation mechanism for the rapid oscillations of magnetic Ap stars. It is shown by a local analysis that, in a superadiabatic shell in the magnetic polar regions of such a star, monotonic convective motions are inhibited and the resultant oscillatory motions grow with time due to the heat exchange between a displaced mass element and its surroundings. The global oscillations induced from such an overstability are then expected to be very high overtones of axisymmetric modes with respect to the magnetic axis and to be responsible for the observed rapid oscillations.

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