Recent work on Cepheid variables

Details Recent work on Cepheid variables Recent work on Cepheid variables

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ssrv...27..389c&link_type=abstract

(International Astronomical Union, Colloquium on Stellar Hydrodynamics, 58th, Los Alamos, N. Mex., Aug. 12-15, 1980.) Space Scie

Astronomy and Astrophysics

Astronomy

9

Cepheid Variables, Convective Heat Transfer, Stellar Mass, Stellar Oscillations, Stellar Radiation, Abundance, Helium, Stellar Envelopes, Stellar Magnetic Fields

Scientific paper

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, but the beginnings of a theory of modal selection are formulated. Recent observational results have led to increased values of the 'pulsation mass', so that this mass is now in agreement with the evolution theory; the 'Wesselink mass' is also satisfactory. The proposal of helium enrichment in the outer stellar layers should satisfactorily resolve the beat (and perhaps also the bump) mass anomaly. A suggestion that part of the pressure in the envelope is due to a tangled magnetic field resolves the mass anomaly about as well as the helium-enrichment hypothesis.

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