Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151..315m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 2, Oct. 1985, p. 315-321.
Astronomy and Astrophysics
Astrophysics
21
A Stars, Peculiar Stars, Starspots, Stellar Atmospheres, Stellar Oscillations, Variable Stars, Magnetic Stars, Stellar Luminosity, Stellar Models, Stellar Rotation, Stellar Spectrophotometry, Stellar Structure
Scientific paper
The influence of the surface inhomogeneities, postulated by the oblique rotator model to explain the mean variability of the Ap stars, on the rapid light variations of some of these stars is discussed. The relevant formalism is derived. A "spotted pulsator model" is introduced, according to which stars with inhomogeneous distribution of surface flux, of the ratio of the flux to radius variation amplitude, and of the phase lag between the flux and radius variations, oscillate in a single mode, symmetric about the rotation axis. Such a model could explain several of the observed features that are difficult to interpret in the frame of Kurtz's oblique pulsator model.
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