Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..314k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 314-327.
Astronomy and Astrophysics
Astrophysics
28
Light Curve, Limb Darkening, Stellar Oscillations, White Dwarf Stars, Absorption Spectra, Integral Equations, Stellar Rotation, Stellar Spectra
Scientific paper
A general formulation is presented for the effects of r-mode nonradial pulsations on the light curves and line profiles of a slowly rotating star, given a pulsation model, and model atmospheres. It is shown that the temperature perturbation, the gravity perturbation, and the light variations are proportional to the spheroidal component of the displacement, while the velocity perturbation is proportional to the toroidal component. Therefore, when calculating the observable effects of r-mode pulsations, it is necessary to include both the toroidal and the spheroidal components of the displacement in the calculations. The formalism is applied to the ZZ Ceti star G117-B15A. The results indicate that the observed variations of G117-B15A are not caused by r-mode pulsations, but are consistent with g-mode pulsations.
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