Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ssrv...27..519k&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
17
Periodic Variations, R Coronae Borealis Stars, Stellar Luminosity, Variable Stars, Nonadiabatic Conditions, Stellar Envelopes, Stellar Evolution, Stellar Models
Scientific paper
The Cepheid-like pulsations of some of the R CrB stars should in principle make it possible to determine their masses and hence to place constraints on possible evolution scenarios. Evidence for these pulsations is briefly reviewed and the problem of how these low-mass, hydrogen-deficient carbon stars could have evolved to their present position in the H-R diagram is discussed. Linear and nonlinear pulsation calculations are reviewed. It is found that for these large luminosity to mass ratio (L/M) stars a region of pulsation instability extends considerably hotter than for normal high luminosity Cepheids. The envelopes of these models are so nonadiabatic that the identification of modes becomes very difficult since there is frequently no clearly defined nodal structure. For the most extreme L/M cases it is found that the models are unstable in the sense that they appear on the verge of ejecting the outer layers.
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