Updated Toulouse solar models including the diffusion-circulation coupling and the effect of $\mu$-gradients

Abstract

New solar models are presented, which have been computed with the most recent physical inputs (nuclear reaction rates, equation of state, opacities, microscopic diffusion). Rotation-induced mixing has been introduced in a way which includes the feed-back effect of the $\mu$-gradient induced by helium settling. A parametrization of the tachocline region below the convective zone has also been added in the computations. The sound velocities have been computed in the models and compared to the seismic sun. Our best model is described in some detail. Besides the new physical inputs, the most important improvement concerns the computations of $\mu$-gradients during the solar evolution and their influence in slowing down rotation-induced mixing. This process can explain why lithium is depleted in the present Sun while beryllium is not, and meanwhile why ${}^3$He has not increased at the solar surface for at least 3 Gyrs.

to be published in Solar Physics

References in corpus (5)

• Microscopic diffusion of partly ionized metals in the Sun and metal-poor stars
• On the coupling between helium settling and rotation-induced mixing in stellar radiative zones : II- Numerical approach
• On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: II- Application to light elements in population I main-sequence stars
• On the Coupling between Helium Settling and Rotation-Induced Mixing in Stellar Radiative Zones: I- Analytical Approach
• Quantum corrections to microscopic diffusion constants

Cited by in corpus (13)

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• Low abundances of heavy elements in the solar outer layers: comparisons of solar models with helioseismic inversions
• Seismic study of the chemical composition of the solar convection zone
• Planet Engulfment Signatures in Twin Stars
• Mass effect on the lithium abundance evolution of open clusters: Hyades, NGC 752, and M67
• New seismic analysis of the exoplanet-host star Mu Arae
• Asteroseismology of solar-type stars: signatures of convective and/or helium cores
• Rotational periods and evolutionary models for subgiant stars observed by CoRoT
• Inversions of the Ledoux discriminant: a closer look at the tachocline
• Rotation and lithium abundance of solar-analog stars. Theoretical analysis of observations
• Scenarios to explain extreme Be depletion in solar-like stars: accretion or rotation effects ?