Mode trapping in sdO models
Source: Astrophysics and Space Science, Volume 329, Numbers 1-2, October 2010 , pp. 205-209(5)
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.
Document Type: Research Article
Affiliations: 1: Laboratoire d’Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 31400, Toulouse, France, Email: firstname.lastname@example.org 2: Laboratorio de Astrofísica Estelar y Exoplanetas, LAEX-CAB (INTA-CSIC), PO BOX 78, 28691, Villanueva de la Cañada, Madrid, Spain, Email: email@example.com 3: Instituto de Astrofísica de Andalucía, IAA-CSIC, 18008, Granada, Spain, Email: firstname.lastname@example.org 4: Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA, Email: email@example.com 5: Institute of Astronomy, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium, Email: firstname.lastname@example.org 6: Universidade de Vigo, 36310, Vigo, Spain, Email: email@example.com
Publication date: October 1, 2010