The evolution and helium content of the sun - Observatoire de Paris Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 1986

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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obspm-03272236 , version 1 (28-06-2021)

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

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