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| Paper: |
Pulsation of supergiant stars |
| Volume: |
11, Confrontation Between Stellar Pulsation and Evolution |
| Page: |
300 |
| Authors: |
Schaller, Gerard |
| Abstract: |
The pulsation periods of massive star models produced by Maeder (1990) evolving with mass loss and covering the upper part of the HRD (M equal to or greater than 15 solar masses) are determined for the fundamental radial mode and for the first and second overtones. A much better agreement than in Lovy (1984) is obtained between theoretical and observed quasi-isoperiods essentially by retaining for the fit only star models in nuclear burning phases. There is a large period difference between supergiants on the first redward tracks and those at a postred supergiant stage (RSG), but at the same location in the HR diagram. The post-RSG star have periods longer by a factor 1.4 or more according to the remaining mass. This is an interesting signature of post-RGB stars, which also exhibit enrichments in the products of the CNO-cycles. |
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