Mode trapping in sdO models

Details Mode trapping in sdO models Mode trapping in sdO models

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329..205r&link_type=abstract

Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 205-209

Astronomy and Astrophysics

Astrophysics

Stars: Oscillations, Stars: Variables

Scientific paper

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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