Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-09-25
AIP Conf. Proc., 2009, vol. 1170, pp. 388-390
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
3 pages, 5 figures; in "Stellar Pulsation: Challenges for Theory and Observations", Proc. of the International Conf., eds. J.
Scientific paper
10.1063/1.3246522
Recent photometric and spectroscopic observations of the hybrid variable Gamma Pegasi (Handler et al. 2009, Handler 2009) revealed 6 frequencies of the SPB type and 8 of the Beta Cep type pulsations. Standard seismic models, which have been constructed with OPAL (Iglesias & Rogers 1996) and OP (Seaton 2005) opacities by fitting three frequencies (those of the radial fundamental and two dipole modes), do not reproduce the frequency range of observed pulsations and do not fit the observed individual frequencies with a satisfactory accuracy. We argue that better fitting can be achieved with opacity enhancements, over the OP data, by about 20-50 percent around the opacity bumps produced by excited ions of the iron-group elements at temperatures of about 200 000 K (Z bump) and 2 million K (Deep Opacity Bump).
Pamyatnykh Alexey A.
Zdravkov Thomas
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