Study of sdO models: mode trapping
arXiv:0912.3911 · doi:10.1111/j.1365-2966.2009.16230.x
Abstract
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.
10 pages, 13 figures, accepted for publication in MNRAS, 2009 December 16
References in corpus (9)
- ADIPLS -- the Aarhus adiabatic oscillation package
- Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
- Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
- Asteroseismic inferences on GW Vir variable stars in the frame of new PG 1159 evolutionary models
- Fe emission and ionized excess absorption in the luminous quasar 3C109 with XMM-Newton
- SDSS J160043.6+074802.9: a very rapid sdO pulsator
- Granada oscillation Code (GraCo)
- The rapidly pulsating sdO star, SDSS J160043.6+074802.9
- Study of sdO models. Pulsation Analysis