Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..133g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 1, March 1986, p. 133-138.
Astronomy and Astrophysics
Astrophysics
6
Cepheid Variables, Convection, Pulsars, Stellar Oscillations, Time Dependence, Heat Flux, Mixing Length Flow Theory, Specific Heat, Thermodynamics
Scientific paper
A linear perturbation of Ulrich's (1976) non-local theory of convection in non-pulsating stars is used to build up a non-local theory for the influence of the convective heat flux on the pulsation of cepheid type stars. The unphysical oscillations observed in eigenfunctions given by local theories are completely eliminated. It is shown that, in regions where the time scale of convection is smaller than that of pulsation, the convective heat flux drives the pulsation. This driving must be added to the damping due to turbulent viscosity which may be included in the theory.
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