2D computations of g modes

Details 2D computations of g modes 2D computations of g modes

2011-09-30

arxiv.org/abs/1109.6856v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages, 4 figures. To appear in the ASP proceedings of "The 61st Fujihara seminar: Progress in solar/stellar physics with hel

Scientific paper

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 nonrotating 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.

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