Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..209g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 209-218.
Astronomy and Astrophysics
Astronomy
24
B Stars, Carbon Stars, Stellar Interiors, Stellar Oscillations, Approximation, Boundary Value Problems, Riccati Equation
Scientific paper
The Riccati method, developed to solve the linear boundary-value problem of radial stellar pulsations, is generalized and shown to be applicable to the calculation of non-radial, nonadiabatic oscillations. Its advantages are demonstrated for the extreme example of a highly nonadiabatic helium star. The acoustic spectrum of helium stars is studied in detail. Mode-coupling instabilities occur in the nonradial spectrum for a wide range of the harmonic degree l, their appearance being similar to the radial case studied previously. With increasing l, the width of the instability strip in the HRD - extending up to log Teff of approximately 4.3 for low l - shrinks, and the growth rates of the instabilities decrease. Stabilization is reached between l = 10 and 100.
Gautschy Alfred
Glatzel Wolfgang
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