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Mode trapping in sdO models |
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| Authors: | C Rodríguez-López A Moya R Garrido J MacDonald R Oreiro A Ulla |
| Institution: | 1. Laboratoire d’Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 31400, Toulouse, France 3. Universidade de Vigo, 36310, Vigo, Spain 4. Instituto de Astrofísica de Andalucía, IAA-CSIC, 18008, Granada, Spain 2. Laboratorio de Astrofísica Estelar y Exoplanetas, LAEX-CAB (INTA-CSIC), PO BOX 78, 28691, Villanueva de la Ca?ada, Madrid, Spain 5. Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA 6. Institute of Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium |
| Abstract: | Mode trapping of high-radial order gravity modes was found for a particular sdO model. The trapping is caused by the change in composition from the helium radiative shell to the hydrogen burning shell. A non-adiabatic effect of this trapping is the higher tendency to instability of the trapped modes. Low- to intermediate-radial order pressure modes (in sdO models they correspond to mixed modes with most nodes in the P-mode region) are found to be trapped by the chemical transition from the carbon-oxygen core to the He burning shell. As the trapping is produced in the deep interior of the star, where energy interchange is negligible at the p-mode frequencies, it has no particular effect on the driving. |
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