Complex asteroseismology of the hybrid B-type pulsator $γ$ Pegasi: a test of stellar opacities

Details Complex asteroseismology of the hybrid B-type pulsator $γ$ Pegasi: a test of stellar opacities Complex asteroseismology of the hybrid B-type pulsator $γ$ Pegasi: a test of stellar opacities

2010-04-14

arxiv.org/abs/1004.2366v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 4 figures, Astronomical Notes, submitted The proceedings of the HELAS IV conference, Lanzarote 1-5 February, 2010, Ed

Scientific paper

Using the updated oscillation spectrum of $\gamma$ Pegasi, we construct a set of seismic models which reproduce two pulsational frequencies corresponding to the $\ell=0$, p$_1$ and $\ell=1$, g$_1$ modes. Then, we single out models which reproduce other well identified modes. Finally, we extend our seismic modelling by a requirement of fitting also values of the complex, nonadiabatic parameter $f$ associated to each mode frequency. Such complex asteroseismology of the B-type pulsators provides a unique test of stellar metallicity and opacities. In contrast to our previous studies, results for $\gamma$ Peg indicate that both opacity tables, OPAL and OP, are equally preferred.

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