SOLAR NEUTRINOS, THE PRESOLAR ABUNDANCE OF HELIUM AND THE SOLAR METALLICITY
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Abstract: (Springer)
The observational estimates of the presolar abundance of helium (Ys) are reviewed and a lower value ofYs ({-0.19 by mass fraction) is suggested to solve the solar-neutrino problem. With this reduced value ofYs it is argued from the point of view of maintaining the luminosity of the Sun at its observed level that the metallicity requirement isZs{-0.013. Previous workers, while considering lowerYs in the range of 0.15÷0.20, have assumedZs in the range of either 0.018÷0.020 or 0.001÷0.004. We suggest that forYs=0.15÷0.20, one should rather considerZs=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 suggestZs{-{0.018±0.005.- ASTROPHYSICS
- NEUTRINO: SOLAR
- HELIUM
- NUMERICAL CALCULATIONS
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