Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59..955t&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, Sept.-Oct. 1982, p. 955-962) Soviet Astronomy (ISSN 0038-5301), vol. 26, Sept.-Oct. 1982, p.
Astronomy and Astrophysics
Astronomy
1
Cepheid Variables, Stellar Oscillations, Chemical Composition, Helium, Hertzsprung-Russell Diagram, Opacity, Stellar Envelopes, Stellar Models
Scientific paper
The stability of models of Delta Scuti-type stars with respect to radial pulsations in the four lowest modes is analyzed in the linear nonadiabatic approximation. It is shown that the positions of the theoretical blue limit (BL) of the instability strip on the H-R diagram strongly depend (Delta logTe roughly equal to 0.03) on the means of calculating the opacity coefficient and on variations of helium content in the envelopes; the influence of other factors is less important. A comparison is made with previous results and with observations; and it is found that the positions of the observed and theoretical (third harmonic) BL are in satisfactory agreement. A nonlinear dependence of the positions of theoretical BL on the helium content Y is obtained; a star with Y roughly equal to 0.2 could pulsate in the instability strip if it is not located too close to the BL.
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