Study of sdO models: mode trapping

Details Study of sdO models: mode trapping Study of sdO models: mode trapping

2009-12-19

arxiv.org/abs/0912.3911v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 13 figures, accepted for publication in MNRAS, 2009 December 16

Scientific paper

We present the first description of mode trapping for sdO models. Mode trapping of gravity modes caused by the He/H chemical transition is found for a particular model, providing a selection effect for high radial order trapped modes. Low- and intermediate-radial order {\em p}-modes (mixed modes with a majority of nodes in the P-mode region) are found to be trapped by the C-O/He transition, but with no significant effects on the driving. This region seems to have also a subtle effect on the trapping of low radial order {\em g}-modes (mixed modes with a majority of nodes in the G-mode region), but again with no effect on the driving. We found that for mode trapping to have an influence on the driving of sdO modes (1) the mode should be trapped in a way that the amplitude of the eigenfunctions is lower in a damping region and (2) in this damping region significant energy interchange has to be produced.

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