SIMBAD references

2013MNRAS.432..822W - Mon. Not. R. Astron. Soc., 432, 822-831 (2013/June-2)

The hybrid b-type pulsator γ Pegasi: mode identification and complex seismic modelling.


Abstract (from CDS):

We present an interpretation of the oscillation spectrum of the early B-type star γ Pegasi, in which both low-order p/g and high-order g-modes are observed. Using amplitudes and phases of the photometric and radial velocity variations, we identify/constrain the mode degree, ℓ, for all 14 detected frequencies. Seismic models fitting two pulsational frequencies corresponding to the modes ℓ = 0, p1 and ℓ = 1, g1 were constructed. This set of models contains those which reproduce also the empirical values of the complex non-adiabatic parameter f associated with these two mode frequencies. Unfortunately, there are no models reproducing the values of f for both frequencies simultaneously, regardless of model atmospheres, opacity data, chemical mixture as well as opacity enhancement in the Z- and deep opacity bumps. Most probably, some modifications of the opacities in stellar interiors are still required.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): opacity - stars: early-type - stars: individual: γ Peg - stars: oscillations

Simbad objects: 6

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