Bump Cepheids - The mass anomaly as an opacity effect

Details Bump Cepheids - The mass anomaly as an opacity effect Bump Cepheids - The mass anomaly as an opacity effect

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..939s&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 939-949.

Other

47

Cepheid Variables, Computerized Simulation, Opacity, Pulsars, Stellar Mass, Stellar Models, Abundance, Phase Shift, Phase Velocity, Radial Velocity

Scientific paper

Nonlinear calculations of models for bump Cepheids indicate that most of the basic features of these stars can be reproduced well by models having normal to nearly normal evolutionary masses and normal helium abundances, if Carson's opacities are adopted. The trends of the properties of the models with various physical parameters are otherwise very similar to those obtained by other authors with the Los Alamos opacities (which have led to Cepheid masses of half the evolutionary masses). Difficulties with the resonance hypothesis of Simon and Schmidt as an explanation of the bump are discussed.

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