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

Abstract

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, for instance, the observed pulsation spectra are modified by rotation to such an extent that it prevents any fruitful interpretation. Our aim is to characterise acoustic pulsation spectra of realistic stellar models in order to be able to interpret asteroseismic data from such stars. The 2-dimensional oscillation code ACOR, which treats rotation in a non-perturbative manner, is used to study pulsation spectra of highly distorted evolved models of stars. 2D models of stars are obtained by a self-consistent method which distorts spherically averaged stellar models a posteriori, at any stage of evolution, and for any type of rotation law. 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.

arXiv comment7 pages, 7 figures, accepted for publication in Astronomy and Astrophysics

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Cited by in corpus (19)

• A new asteroseismic diagnostic for internal rotation in $\gamma$ Doradus stars
• Very regular high-frequency pulsation modes in young intermediate-mass stars
• γ Doradus stars as test of angular momentum transport models
• Observational $\Delta \nu$-$\bar{\rho }$ relation for $\delta$ Sct stars using eclipsing binaries and space photometry
• Deciphering the oscillation spectrum of $\gamma$ Doradus and SPB stars
• First evidence of inertial modes in $\gamma$ Doradus stars: The core rotation revealed
• Precise surface gravities of $\delta$ Scuti stars from asteroseismology
• Unexpected series of regular frequency spacing of delta Scuti stars in the non-asymptotic regime -- II. Sample -- echelle diagrams and rotation
• Unexpected series of regular frequency spacing of delta Scuti stars in the non-asymptotic regime -- I. The methodology
• Oscillations of 2D ESTER models. I. The adiabatic case
• The traditional approximation of rotation for rapidly rotating stars and planets. II. Deformation and differential rotation
• Study of the low-order $\Delta \nu$-$\bar{\rho }$ relation for moderately-rotating $\delta$ Scuti stars and its impact on their characterisation
• Convection in Oblate Solar-Type Stars
• Non-adiabatic pulsations in ESTER models
• Regularities in the spectrum of chaotic p-modes in rapidly rotating stars
• Modelling $\delta$ Scuti pulsations: A new grid of p, g, and f modes across pre-main-sequence to post-main-sequence evolution
• RUBIS: a simple tool for calculating the centrifugal deformation of stars and planets
• An observer's view on the future of asteroseismology
• Scaling of oscillation frequencies in rotating stars