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Recent work on Cepheid variables

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Abstract

Recent work on Cepheids is reviewed in the areas of (1) the large-amplitude mode behavior, (2) convection, and (3) Cepheid masses. Initial-value type nonlinear calculations have not yet yielded true double-mode behavior. Yet we have the beginnings of a promising theory of modal selection. Theoretical calculations also yield reasonably located red edges to Cepheid (and Cepheid-like) instability regions.

Recent observational results have led to increased values of the “pulsation mass,” so that this mass is now in fair agreement with evolution theory. The “Wesselink mass” is also satisfactory. Thus now only “bump” and “beat” masses are possibly discrepant. Some possible ways which have been suggested to alleviate these discrepancies are reviewed. The proposal of helium enrichment in the outer stellar layers can apparently satisfactorily resolve the beat (and perhaps also the bump) mass anomaly. A recent suggestion that part of the pressure in the envelope is due to a tangled magnetic field (not unusually strong) resolves the above mass anomaly about as well as the helium-enrichment idea does.

Recent results regarding duplicity and period changes in Cepheids are reviewed.

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Authors and Affiliations

  1. Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards, 80309, Boulder, Colorado

    J. P. Cox

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Cox, J.P. Recent work on Cepheid variables. Space Sci Rev 27, 389–399 (1980). https://doi.org/10.1007/BF00168325

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