Pulsations of model RR Lyrae stars

Details Pulsations of model RR Lyrae stars Pulsations of model RR Lyrae stars

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..232b&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Nov. 15, 1979, p. 232-244. Research supported by the Science Research Council and NSF.

Mathematics

Complex Variables

72

Cepheid Variables, Nonadiabatic Conditions, Oscillations, Stellar Models, Anisotropy, Complex Variables, Equilibrium Equations, Gas Ionization, Stellar Temperature, Work Functions

Scientific paper

Radial pulsations of models of RR Lyrae stars are studied in linearized nonadiabatic theory. Convection in the hydrogen and helium ionization zones is treated by use of a time-dependent generalization of mixing-length theory. In a series of models of constant mass, luminosity, and composition, effective temperature is varied as a parameter. It is found, in agreement with previous work, that models in the instability strip are pulsationally unstable. Cooler models, however, are stabilized by the convention. Very cool models with deep convective envelopes are nearly neutrally stable to pulsation.

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