Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44...27z&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 1, p. 27-43.
Astronomy and Astrophysics
Astronomy
20
Periodic Variations, Radiative Transfer, Stellar Oscillations, Supergiant Stars, Black Body Radiation, Boundary Conditions, Diffusion, F Stars, Stellar Models, Wentzel-Kramer-Brillouin Method
Scientific paper
The properties of linear nonadiabatic pulsations for radial and nonradial acoustic modes in low-mass supergiant stars in the diffusion approximation and with radiative transfer are discussed. Although strange modes are found both for radial and nonradial modes, their frequencies and excitation rates depend sensitively on the description of the outer stellar layers. An asymptotic WKB analysis which takes into account the strong nonlinearity in entropy perturbation is used to examine the influence of nonadiabaticity on the pulsation modes; it is found that for strong nonadiabaticity two types of modes are possible, viz. either ordinary or strange modes. Their frequencies are determined by the location of the H/He ionization zone.
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