Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..90..261g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 90, no. 2, Feb. 1983, p. 261-276.
Astronomy and Astrophysics
Astrophysics
1
Abundance, Stellar Evolution, Stellar Models, Stellar Oscillations, Variable Stars, Adiabatic Equations, Cepheid Variables, Gas Ionization, Helium, Hertzsprung-Russell Diagram, Hydrogen, Nonadiabatic Theory, Opacity, Supergiant Stars
Scientific paper
A study of pulsational properties with evolution has been done for a 15.6 M_sun; star with Xe = 0.90 and Ye = 0.08. Pulsational properties in the hydrogen-burning stages have been compared with those in helium-burning stages. A comparison with observed characteristics of β Cepheids, classical Cepheids and supergiant variables has been made during the course of its evolution. In addition, models of 5, 9, and 15 M_sun; with Xe = 0.708, Ye = 0.272 have also been studied for pulsational properties during the helium burning stage. It is also seen that pulsational instability is sensitive to changes in initial chemical composition and opacity parameters. A low helium abundance could be a reason for the stability of the models, even when lying in the instability strip of the H-R diagram.
Badalia J. K.
Gurm Hardev S.
Sukhija H. M.
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