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Element Diffusion in the Solar Interior

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arxiv astro-ph/9304005 v1 pith:IRTLN253 submitted 1993-04-06 astro-ph

classification astro-ph
keywords diffusionelementelementsevolutiongiveheliuminteriorsimple
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abstract

We study the diffusion of helium and other heavy elements in the solar interior by solving exactly the set of flow equations developed by Burgers for a multi-component fluid, including the residual heat-flow terms. No approximation is made concerning the relative concentrations and no restriction is placed on the number of elements considered. We give improved diffusion velocities for hydrogen, helium, oxygen and iron, in the analytic form derived previously by Bahcall and Loeb. These expressions for the diffusion velocities are simple to program in stellar evolution codes and are expected to be accurate to $\sim 15\%$. Our complete treatment of element diffusion can be directly incorporated in a standard stellar evolution code by means of an exportable subroutine, but, for convenience, we also give simple analytical fits to our numerical results.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. MAISTEP -- a new grid-based machine learning tool for inferring stellar parameters I. Ages of giant-planet host stars

    astro-ph.SR 2025-02 conditional novelty 5.0 of 10

    MAISTEP, a stacked ensemble of tree-based machine learning models trained on MESA stellar grids, infers stellar ages from atmospheric constraints and finds Hot Jupiter hosts are younger than Warm and Cold Jupiter hosts.

  2. The chemical make-up of the Sun: A 2020 vision

    astro-ph.SR 2021-05 accept novelty 5.0 of 10

    Revised solar photospheric abundances yield Z/X = 0.0187 with C, N, O at 8.46, 7.83, 8.69, preserving the solar modeling discrepancy and revealing a modest volatile-refractory offset from CI chondrites.

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