Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mmsai..55..129k&link_type=abstract
(European Physical Society, Ministero della Pubblica Istruzione, and Universita di Catania, EPS Study Conference on Oscillations
Astronomy and Astrophysics
Astronomy
1
Nonstabilized Oscillation, Solar Gravitation, Solar Interior, Solar Oscillations, Vibration Mode, Abundance, Heavy Elements, Stellar Models
Scientific paper
A quasi-adiabatic approximation is used to calculate the stability of nonradial g-mode oscillations in evolutionary solar models with initial heavy-element abundances (Z0) = 0.02 and 0.001. The model parameters and the calculated periods and damping times are presented in tables, and a graph of the evolution of growth rates is provided. In the model with Z0 = 0.02, low g-modes with l = 1 are unstable during the main-sequence phase from 250 Myr to 3.8 Gyr, but all modes are stable (except for the l = 1 g2-mode) in the present. In the model with Z0 = 0.001, however, the g1 and g2 modes with l = 1 are unstable due to a destabilization epsilon mechanism, and the amplitude growth time is of the order 10 Myr. These results suggest that high-degree g-modes are resonantly excited.
Kosovichev Aleksandr G.
Severnyi A. B.
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