A hydrodynamic study of pulsation in low surface-gravity stars

Details A hydrodynamic study of pulsation in low surface-gravity stars A hydrodynamic study of pulsation in low surface-gravity stars

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.132..337n&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 132, no. 2, April 1987, p. 337-352.

Astronomy and Astrophysics

Astrophysics

8

Magnetohydrodynamics, Stellar Gravitation, Stellar Models, Stellar Oscillations, Supergiant Stars, Cepheid Variables, Gravitational Effects, Periodic Variations, Shock Waves, Stellar Atmospheres

Scientific paper

The pulsation of low surface-gravity stars is investigated with a model sequence of yellow supergiant stars. The parameters of models are L = 3200 solar luminosities, T(eff) = 5300 K, and M = 2.0, 1.5, 1.25, 1.0 solar masses. The character of the pulsation changes drastically with decreasing surface-gravity. Two massive models converge to each limit-cycle, but two less massive models show only quasi-periodic behavior. The amplitudes of the latter models change every several cycles with strong shock waves. Violent phenomena in the outer atmosphere may cause the mass-loss. The pulsation periods are close to the linear nonadiabatic ones derived by using Takeuti's (1964) boundary conditions.

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