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Seismic analysis of the second ionization region of helium in the Sun - I. Sensitivity study and methodology

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Figure

Figure 1. Plot of the adiabatic exponent Ŵ1 for various solar models. As areference we have calculated a model (Z0) in which the second ionizationof helium has been suppressed
Figure 2. (a) Plot of the differences (the differences atand the other without the second ionization of helium, versus the acousticdepthδŴ1/Ŵ1) between two models, one with τ
Figure 3. (a) Residuals left after a smooth component of the frequencies,60 are shown as filled circles, while modes with a higher value of the degreeare represented by open circles
Table 1. Parameters obtained by fitting the observed solar frequency datafrom 200 simulations of the effect of the observational uncertainties on theparameters using equation (10)
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