Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..316b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 316-326.
Astronomy and Astrophysics
Astrophysics
13
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.
Bienayme Olivier
Maeder Andre
Schatzman Evry
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