[en] 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 δ Scuti, γ Doradus, and Be stars, the observed pulsation spectra are modified by rotation to such an extent that it prevents any fruitful interpretation. <BR /> 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. <BR /> 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. <BR /> 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 échelle diagram can be built. Mixed gravito-acoustic modes are calculated in rapidly rotating models for the first time.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ouazzani, R.-M.; Stellar Astrophysics Centre, Department of Physics and AstronomyAarhus University, Ny Munkegade 120, 8000, Aarhus C, Denmark
Roxburgh, I. W.; Astronomy Unit, Queen Mary University of London, Mile End Road, London, E1 4NS, UK
Dupret, Marc-Antoine ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Language :
English
Title :
Pulsations of rapidly rotating stars. II. Realistic modelling for intermediate-mass stars
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