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2D Computations of g-modes in Fast Rotating Stars
Ballot, J.; Lignières, F.; Prat, V. et al.
2012In Shibahashi, H; Takata, M; Lynas-Gray, A. E. (Eds.) Progress in Solar/Stellar Physics with Helio- and Asteroseismology
 

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Abstract :
[en] We present complete 2D computations of g-modes in distorted polytropic models of stars performed with the Two-dimensional Oscillation Program (TOP). We computed low-degree modes (ℓ =1 modes with radial order n = -1,…,-14, and ℓ = 2, 3 modes with n = -1,…,-5 and -16,…,-20) of a non-rotating model and followed them by slowly increasing the rotation rate up to 70 % of the Keplerian break-up velocity. We use these computations to determine the domain of validity of perturbative methods up to the 3rd order. We study the evolution of the regularities of the spectrum and show quantitative agreement with the traditional approximation for not too large values of the ratio of the rotation rate to the pulsation frequency. We also show the appearance of new types of modes, called “rosette” modes due to their spatial structure. Thanks to the ray theory for gravito-inertial waves that we developed, we can associate these modes with stable periodic rays.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Ballot, J.
Lignières, F.
Prat, V.
Reese, Daniel ;  Observatoire de Paris > Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
Rieutord, M.
Language :
English
Title :
2D Computations of g-modes in Fast Rotating Stars
Publication date :
01 September 2012
Event name :
"Progress in Solar/Stellar Physics with Helio- and Asteroseismology" Fujihara Seminar
Event place :
Hakone, Japan
Event date :
13-17 March, 2011
Audience :
International
Main work title :
Progress in Solar/Stellar Physics with Helio- and Asteroseismology
Editor :
Shibahashi, H
Takata, M
Lynas-Gray, A. E.
Pages :
389
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since 17 January 2013

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