Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-07-07
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
11 pages, 7 figures, To appear in the ASP proceedings of "The 61st Fujihara seminar: Progress in solar/stellar physics with he
Scientific paper
In cool stars that oscillate like the Sun, non-radial modes become mixed as the stars evolve. The mixing is caused by the coupling between g-modes in the stellar core and p-modes in the envelope, which results in distinctly different and more complex frequency spectra for subgiants and red giants than seen in main sequence stars. Using a new version of the `scaled' \'echelle diagram, I illustrate how the frequencies of non-radial modes evolve during the evolution from the main sequence to the red giant branch, and I show how they depend on stellar mass and metallicity. Then, with focus on the dipole (l = 1) modes, which show the strongest effects from mixing, I present a toy model to fit, and hence identify, those modes in a large series red giant models.
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