Nonradial pulsational instability of massive stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Nuclear Reactions, Stellar Mass, Stellar Models, Stellar Structure, Astrophysics, Critical Mass, Eigenvalues, Nonadiabatic Conditions, Pulses

Scientific paper

Pulsational eigenfrequencies and stability coefficients of the lowest modes of nonradial quadrupole (l = 2) oscillation have been obtained for chemically homogeneous stellar models constructed with Carson's (1976) radiative opacities. Instability is found to develop as a result of the same operation of the kappa-mechanism in the CNO ionization zone and at nearly the same stellar masses as was the case for the radial (l = 0) modes studied previously. A survey of the l = 5 modes indicates that the instability gradually declines with increasing degree of the spherical harmonics.

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