Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..89..435t&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 2, Jan. 1983, p. 435-445.
Astronomy and Astrophysics
Astrophysics
4
Cepheid Variables, Hertzsprung-Russell Diagram, Stellar Oscillations, Chemical Composition, Convection, Opacity, Stellar Envelopes
Scientific paper
Models of Delta Scuti stars are tested against radial pulsations in the four lowest models, using a linear, nonadiabatic approximation. It is shown that the theoretical blue edge locations of the instability strip on the H-R diagram depend strongly on both opacity interpolation and variations of the envelope helium abundance Y. Several other factors have small effect: variations of the heavy element abundance Z, the use of various opacity tables, the treatment of convection, and the number of envelope mass zones. A comparison with both results obtained by various authors and observations is performed. The locations of the observed blue edge and our theoretical third-harmonic ones are consistent. A nonlinear dependence of the theoretical blue edge locations on envelope helium abundance Y is derived. A star with Y of approximately 0.2 may pulsate within the instability strip, if it is not near the blue edge.
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