Department of Physics and Astronomy: Publications and Other Research
Date of this Version
1981
Document Type
Article
Citation
Bulletin of the American Astronomical Society, Vol. 13, p. 871 (1981).
Abstract
Numerical experiments are conducted with a view toward constructing Cepheid models which satisfy observational and theoretical constraints. Pulsation analysis is performed in the linear theory. Radiative models are studied, as well as those in which the H-zone is spread in a manner that mimics the effect of mixing-length convection. When the influence of convection on pulsation is examined in two artificial limits, adiabatic and isothermal, the former is found to be unsatisfactory, the latter tentatively acceptable. Following the results of earlier investigations, we test the effect of opacity on pulsational period ratios. It is found that an approximate doubling of the envelope opacity for temperatures > 105 K seems sufficient (this work is still in a preliminary stager-to satisfy observational constraints with otherwise normal evolutionary models in both the double mode and bump Cepheid domains.
Comments
Copyright 1981 American Astronomical Society.