Stellar evolution with turbuelnt diffusion mixing. IV Intermediate and low mass stars and C-12/C-13 ratio in giants of the first ascending branch

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Carbon 12, Main Sequence Stars, Red Giant Stars, Stellar Evolution, Stellar Mass, Turbulent Diffusion, Turbulent Mixing, Abundance, Carbon 13, Molecular Weight, Radial Distribution, Stellar Models

Scientific paper

It has been suggested that mild turbulence is present in the radiative zones of rotating stars. Such turbulence has the effect to modify the surface abundance of processed elements. Stellar evolution in stars with masses in the range from one to three solar masses is considered, and an attempt is made to solve the puzzle of surface abundances (Li and Be in main sequence stars and C-12/C-13, C/N ratios in giants) by a unique physical process, turbulent diffusion. Attention is given to instabilities and turbulent mixing, the method employed for numerical simulations, stellar models with and without turbulent diffusion, semistationary models with inhibition of the diffusion, and a 1.5 solar mass model. The comparison of the considered models with red giants at the first dredge-up confirms the idea of turbulent transport during the life near the main sequence.

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