GYRE: an open-source stellar oscillation code based on a new Magnus Multiple Shooting scheme

Type Journal Article
Names R. H. D. Townsend, S. A. Teitler
Publication Monthly Notices of the Royal Astronomical Society
Volume 435
Pages 3406-3418
Journal Abbreviation Monthly Notices of the Royal Astronomical Society
Date November 1, 2013
DOI 10.1093/mnras/stt1533;
ISSN 0035-8711
Short Title GYRE
Library Catalog
Abstract We present a new oscillation code, GYRE, which solves the stellar pulsation equations (both adiabatic and non-adiabatic) using a novel Magnus Multiple Shooting numerical scheme devised to overcome certain weaknesses of the usual relaxation and shooting schemes appearing in the literature. The code is accurate (up to sixth-order in the number of grid points), robust, efficiently makes use of multiple processor cores and/or nodes and is freely available in source form for use and distribution. We verify the code against analytic solutions and results from other oscillation codes, in all cases finding good agreement. Then, we use the code to explore how the asteroseismic observables of a 1.5 M⊙ star change as it evolves through the red-giant bump.
Tags Methods: Numerical, STARS: OSCILLATIONS, STARS: VARIABLES: GENERAL, Stars: Evolution, Stars: Interiors
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