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| Paper: |
Nonradial Modes in Cool Stars |
| Volume: |
462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology |
| Page: |
200 |
| Authors: |
Stello, D. |
| Abstract: |
In cool stars that oscillate like the Sun, nonradial 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’ échelle diagram, I
illustrate how the frequencies of nonradial 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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