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The evolution and helium content of the sun

Abstract : 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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https://hal-obspm.ccsd.cnrs.fr/obspm-03272236
Contributor : Yveline Lebreton Connect in order to contact the contributor
Submitted on : Monday, June 28, 2021 - 11:09:02 AM
Last modification on : Monday, June 28, 2021 - 11:09:02 AM

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Y. Lebreton, A. Maeder. The evolution and helium content of the sun. Astronomy and Astrophysics - A&A, EDP Sciences, 1986. ⟨obspm-03272236⟩

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