Solar neutrinos, the presolar abundance of helium and the solar metallicity
Tóm tắt
The observational estimates of the presolar abundance of helium (Y s) are reviewed and a lower value ofY s ({-0.19 by mass fraction) is suggested to solve the solar-neutrino problem. With this reduced value ofY s it is argued from the point of view of maintaining the luminosity of the Sun at its observed level that the metallicity requirement isZ s{-0.013. Previous workers, while considering lowerY s in the range of 0.15÷0.20, have assumedZ s in the range of either 0.018÷0.020 or 0.001÷0.004. We suggest that forY s=0.15÷0.20, one should rather considerZ s=0.01÷0.02 in order to obtain a global solution that explains the observed modes of solar oscillation as well as the observed neutrino flux. This solution is quite interesting as we find that the real uncertainties in the determination of the solar metallicity arising from the diversity in existing models of the solar atmosphere suggestZ s{-{0.018±0.005.
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