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

Using the updated oscillation spectrum of gamma Pegasi, we construct a set of seismic models which reproduce two pulsational frequencies corresponding to the l = 0, p(1) and l = 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. (C) 2010 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim