Some thoughts on the rapidly oscillating AP stars

Details Some thoughts on the rapidly oscillating AP stars Some thoughts on the rapidly oscillating AP stars

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339.1038p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 1038-1043.

Astronomy and Astrophysics

Astrophysics

2

A Stars, Peculiar Stars, Stellar Magnetic Fields, Stellar Oscillations, Eigenvalues, Line Spectra, Periodic Variations, Standing Waves

Scientific paper

The effects of combining a weak, axisymmetric magnetic field and slow rotation on the adiabatic pulsation frequencies of Ap stars are discussed. It is shown that standing wave patterns on the surface of the star are produced when the magnetic field dominates the rotation. When rotation is more important than the magnetic field, the standing waves are split into the usual running waves. It is shown how the standing waves affect the line profiles of the star during a pulsation cycle. When compared to the line profile variations of a running wave, distinct differences are seen. The standing waves resemble a radial pulsation at some rotation phases and almost disappear one-quarter of a rotation cycle later.

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