Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..563p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 563-572.
Astronomy and Astrophysics
Astronomy
12
A Stars, Main Sequence Stars, Metallic Stars, Stellar Evolution, Stellar Models, Variable Stars, Hertzsprung-Russell Diagram, Line Spectra, Stellar Envelopes, Stellar Spectra
Scientific paper
An attempt is made to report on a study carried out to compare the pulsation properties of observed Delta Scuti stars with those of models of normal A stars and to investigate the pulsational stability of models of Am stars. An extensive grid of models of normal A stars is constructed and then analyzed for stability using the linear nonadiabatic approach. Results from a previous study of models of Am stars are adapted, and the models are analyzed for stability against radial pulsation by employing the same approach. Results of the stability analyses are presented in terms of growth rates for the fundamental, first-overtone, and second-overtone radial modes. The blue edges determined are shown to be in reasonable agreement with previously published results as well as with observational blue edges. Limitations of the linear nonadiabatic method are briefly discussed.
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