Stability of nonradial g/sup +/-mode pulsations in 1 M/sub sun/ models
Journal Article
·
· Astrophys. J.; (United States)
The stability of nonradial g/sup +/ modes with low l in evolutionary solar models is examined by employing a linear nonadiabatic analysis. In order to include the effect of the interaction between pulsation and convection, we use a time-dependent convection theory which suppresses rapid spatial oscillations of thermal eigenfunctions. The analysis confirms previous results based on quasi-adiabatic analyses. That is, some low-order g/sup +/ modes are unstable in the early evolutionary stages of the models. In these cases, the effect of the convection zone in the envelope is relatively small. We find that the g/sub 2/ /sup +/ mode with l=1 (with a period of about 80 minutes) is unstable even in a model of age 4.5 x 10/sup 9/ yr. This mode is excited by both the driving mechanisms of the /sup 3/He+/sup 3/He reaction in the core and the hydrogen ionization in the envelope. A larger mixing length yields stronger excitation, but the dependence is not strong.
- Research Organization:
- Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards
- OSTI ID:
- 6981993
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 240:2; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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