The evolution and helium content of the sun

Details The evolution and helium content of the sun The evolution and helium content of the sun

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161..119l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 119-124.

Physics

38

Helium, Solar Neutrinos, Stellar Composition, Stellar Evolution, Opacity, Red Giant Stars, Solar Oscillations, Star Clusters, Stellar Luminosity, Stellar Physics

Scientific paper

Based on Los Alamos opacities including molecular absorption at low temperatures, and updated solar model constraints including an age of 4.6 x 10 to the 9th yr, an initial helium content of Y = 0.279 is found which is higher than the previously accepted value. The location of the red giant branch of NGC 188 is well reproduced with the required mixing-length ratio alpha value of 1.9. The model implies a neutrino flux 74 percent higher than the accepted value and a solar neutrino discrepancy with experimental values on the order of a factor of six. The value of the period spacing of low-degree gravity modes in the solar oscillations is, however, found to be closer to the observed one, and the present Y value implies a relative helium to galactic enrichment ratio of 1.8, which is more consistent with stellar nucleosynthesis and galactic evolution models.

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