Details

Autor(en) / Beteiligte

• Ouazzani, R-M
• Roxburgh, I W
• Dupret, M-A

Titel

Pulsations of rapidly rotating stars: II. Realistic modelling for intermediate-mass stars

Ist Teil von

• Astronomy and astrophysics (Berlin), 2015-07, Vol.579, p.A116

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2015

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Context. Very high precision seismic space missions such as CoRoT and Kepler provide the means for testing the modelling of transport processes in stellar interiors. For some stars, such as delta Scuti, gamma Doradus, and Be stars, the observed pulsation spectra are modified by rotation to such an extent that it prevents any fruitful interpretation. Aims. Our aim is to characterise acoustic pulsation spectra of realistic stellar models in order to be able to interpret asteroseismic data from such stars. Methods. The 2D oscillation code ACOR, which treats rotation in a non-perturbative manner, is used to study pulsation spectra of highly distorted evolved models of stars. Two-dimensional models of stars are obtained by a self-consistent method that distorts spherically averaged stellar models a posteriori, at any stage of evolution, and for any type of rotation law. Results. Four types of modes are calculated in a very dense frequency spectrum, among which are island modes. The regularity of the island modes spectrum is confirmed and yields a new set of quantum numbers, with which an echelle diagram can be built. Mixed gravito-acoustic modes are calculated in rapidly rotating models for the first time.