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A hydrodynamic study of pulsation in low surface-gravity stars

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Abstract

The pulsation of low surface-gravity stars is investigated with a model sequence of yellow supergiant stars. The parameters of models areL=3200 L⊙,T eff=5300 K, andM=2.0, 1.5, 1.25, 1.0M ⊙. 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 behaviour. 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 boundary conditions.

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Authors and Affiliations

  1. Chiba-Keizai Junior College, Chiba, Japan

    Michinori Nakata

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  1. Michinori Nakata
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Nakata, M. A hydrodynamic study of pulsation in low surface-gravity stars. Astrophys Space Sci 132, 337–352 (1987). https://doi.org/10.1007/BF00641764

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