Influence of the equation of state on the solar five-minute oscillation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Equations Of State, Solar Oscillations, Solar Spectra, Stellar Models, Stellar Structure, Thermodynamic Equilibrium

Scientific paper

Solar models have been computed with an equation of state taking the electrostatic corrections into account for Z equal to 0.018 and 0.02. They lead to initial hydrogen abundances lower than found by Shibahashi et al. (1983) and by Ulrich and Rhodes (1983). The results have been compared with those of other groups and the influence of the numerical code used for the computation of the frequencies is discussed. It is shown that differences between codes are not responsible for differences in the frequencies larger than 2 micro-Hz. Larger deviations must find their origin in physical differences between models. The deviations between theoretical frequencies are however smaller than the discrepancy with observation and all standard solar models fail to reproduce the observations. It is therefore concluded that something is missing in the physics of solar evolution. This missing effect should lead to a model with a deeper convective zone.

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