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| Paper: |
Pulsations of hydrogen-deficient stars |
| Volume: |
11, Confrontation Between Stellar Pulsation and Evolution |
| Page: |
557 |
| Authors: |
Saio, Hideyuki |
| Abstract: |
The present understanding on the pulsations of luminous hydrogen-deficient (helium) stars is reviewed. Models with M of about 0.8 - 1.1 solar mass and L of about 10,000 solar luminosities roughly reproduce qualitative characters of pulsations of helium stars. There are several problems to be solved in the future. The excitation mechanism for the radial pulsations of luminous helium stars is not understood, although theoretical models give unstable modes whose periods are consistent with observations. The light amplitude of nonlinear hydrodynamic models tend to be too large compared to the observed amplitudes. The excitation mechanisms for the radial pulsation of V 652 Her and for the long period g-mode pulsations in some hot helium stars are not known. |
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