Nonradial Oscillations of Evolved Stars. I. Quasiadiabatic Approximation
Abstract
Linear oscillations of stars consisting of an extended envelope and a highly condensed core are investigated. For such stars, even high frequency modes become essentially internal gravity waves of short wavelength in deep stellar interior. A suitable method of solution of fourth order equation for adiabatic oscillations is described. Numerical solution for l=0 (radial pulsation) and l=2 modes have been obtained for a Cepheid model. Quasiadiabatic estimation of dissipation indicates that the Cepheid-type stars are vibrationally stable against nonradial perturbations.
- Publication:
-
Acta Astronomica
- Pub Date:
- 1971
- Bibcode:
- 1971AcA....21..289D
- Keywords:
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- GLOBAL MODES;
- OSCILLATIONS;
- THEORY