PHysics of Oscillating STars
Published December 4, 2018 | Version v1
Conference paper Open

R-mode oscillations ubiquitous in stars

Authors/Creators

  • 1. Astronomical Institute, Graduate School of Science, Tohoku University

Contributors

Description

We discuss properties and examples of r-mode (large scale Rossby wave) oscillations in rotating stars. Motions are nearly toroidal but affected weakly by buoyancy. R modes seem to be excited mechanically in most cases, and  ubiquitous in various types of rotating stars;e.g., fast rotating $\gamma$ Dor stars, spotted stars, eclipsing binary stars, Be stars, and accreting white dwarfs. In the Fourier spectrum of a star, even (i.e., symmetric to the equator) r modes of azimuthal order $m$ appear as a group of frequencies just below $m$ times the rotation frequency. From this property, a rotation frequency can be determined if r modes are detected. We discuss r modes in KIC~8462852 (Boyajian's star), KIC~9117875 (Am star), KIC~6128830 (HgMn star), and the accreting white dwarf in the dwarf nova GW~Lib.

 

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