Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..341n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 341-343.
Astronomy and Astrophysics
Astrophysics
8
B Stars, Stellar Composition, Stellar Envelopes, Stellar Evolution, Stellar Oscillations, Helium Hydrogen Atmospheres, Stellar Mass, Stellar Models, Stellar Structure
Scientific paper
The influence of a hydrogen-rich envelope on the vibrational stability of helium stars is studied. It is shown that replacing the outermost helium layers by hydrogen-rich ones has the sole effect of increasing the stellar radius and, accordingly, the central condensation. Linear stability analysis towards radial perturbations has been performed on these models. Such an effect increases the amplitude ratio between the surface and the center of the adiabatic eigenfunction corresponding to the fundamental mode. This enhances the stabilizing role of the flux term in the expression of the damping coefficient, and the critical mass increases as the hydrogen-rich envelope mass, M(H), grows. From a value of 16 solar masses for pure helium stars, the critical mass becomes 25 solar masses when M(H) = 0.00001, in fraction of the total mass, and is greater than 80 solar masses when M(H) = 0.00001.
Magain E.
Noels Arlette
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