Classical bump Cepheids - Reconciliation of theory with observations

Details Classical bump Cepheids - Reconciliation of theory with observations Classical bump Cepheids - Reconciliation of theory with observations

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..196c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 1, 1988, p. 196-206. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

26

Cepheid Variables, Hertzsprung-Russell Diagram, Stellar Interiors, Stellar Luminosity, Stellar Oscillations, Binary Stars, Statistical Analysis, Stellar Evolution, Stellar Mass, Supergiant Stars

Scientific paper

New models of classical bump Cepheids lying along the Cepheid ridge line in the H-R diagram are computed to obtain a more accurate set of predicted surface velocity curves. Acceptable Cepheid models are found to be 0.5 mag brighter at a fixed stellar mass than standard evolutionary models. All the previously obtained manifestations of the Cepheid mass discrepancy, except for the anomalous double-mode Cepheid masses, are resolved, at least in a statistical sense, by accepting the implied luminosity increase. The need for the luminosity increase is independently inferred from standard evolutionary models of intermediate-mass and high-mass giant and supergiant stars from their location in the observational H-R diagram.

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