Pulsations of the R Coronae Borealis stars

Details Pulsations of the R Coronae Borealis stars Pulsations of the R Coronae Borealis stars

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ssrv...27..529c&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

34

B Stars, Carbon Stars, R Coronae Borealis Stars, Stellar Mass, Stellar Oscillations, Supergiant Stars, Variable Stars, Eigenvalues, Helium, Nonadiabatic Theory, Opacity, Protostars, Stellar Luminosity, Stellar Temperature, Supernovae

Scientific paper

The radial pulsations of very luminous, low-mass models (luminosity/mass ratio approximately 10,000 times solar), which are possible representatives of the R CrB stars, have been examined. These pulsations are extremely nonadiabatic. It is found that there are in some cases at least one extra (strange) mode which makes interpretation difficult. The blue instability edges are also peculiar, in that there is an abrupt excursion of the blue edge to the blue for luminosity/mass ratios sufficiently large. The range of periods of the model encompasses observed periods of the Cepheid-like pulsations of actual R CrB stars.

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