Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..91..319g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 91, no. 2, April 1983, p. 319-325.
Astronomy and Astrophysics
Astrophysics
Abundance, Helium Hydrogen Atmospheres, Opacity, Stellar Evolution, Stellar Models, Variable Stars, Chemical Composition, Gas Ionization, Stellar Temperature
Scientific paper
An attempt has been made to study the effects of the opacity mechanisms on pulsational instability of some theoretical models having different masses and being in different evolutionary stages. Different combinations of the opacity exponents n, s, and helium-hydrogen ratio, B, have been considered. Based on these combinations, Gamma-mechanism and Kappa-mechanism have been compared. Gamma-mechanism (n = 0, s = 0) is found to be totally ineffective for B = 0.01 in producing a driving force. Even a high value of B (= 0.38) is also not suitable for instability. The combination of n = 0.7, s = 2.1, and B = 0.25 has been found to give the largest negative dissipation for a 15.6 M_sun; star in hydrogen-burning phase although the same does not hold for the helium-burning phase. The conditions in which these excitation mechanisms could be most effective have been discussed.
Badalia J. K.
Gurm Hardev S.
Sukhija H. M.
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