Physics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..519b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 3, p. 519-535.
Physics
48
Light Curve, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, Amplitudes, Spherical Harmonics, Stellar Models, Stellar Physics
Scientific paper
The study reproduces the characteristic peak shape of the light curves of the large-amplitude ZZ Ceti stars by nonadiabatic calculations where the horizontal motions and the pressure changes are assumed to be sinusoidal but where the temperature changes in the ionization zone are treated nonlinearly. The nonsinusoidal shape is associated with the change between convective and radiative energy transport in the deeper layers of the hydrogen ionization zone. Quantitative agreement with the observations is obtained if the modes which cause the large-amplitude brightness are assumed to be of spherical degree of 1. Given the frequency, phase, amplitude, degree, and spherical order of the excited modes, the way in which the phase and amplitude of the primary, first-harmonic, and first-order cross-frequency components of the apparent brightness changes can be calculated is shown.
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