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| Paper: |
Boundary Conditions on Stellar Convection |
| Volume: |
293, 3D Stellar Evolution |
| Page: |
157 |
| Authors: |
Young, P. A.; Knierman, K. A.; Rigby, J. R.; Arnett, D. |
| Abstract: |
We present a theoretical description of extra mixing in stars based upon an examination of the boundary conditions between convectively stable and unstable regions, motivated by multi-dimensional numerical simulations. Gravity waves generated at the boundary are dissipated, resulting in microscopic mixing outside the formal convection zone. This prescription naturally results in less overshooting in convective envelopes and low mass cores than in high mass convective cores. Tests of this description in the stellar evolution code TYCHO produce carbon stars on the asymptotic giant branch (AGB), an isochrone age for the Pleiades consistent with lithium depletion ages from brown dwarfs, and lithium and beryllium depletion consistent with observations of the Hyades, all without free parameters.The potential insight into the different contributions of rotational and hydrodynamic mixing processes could have important implications for realistic simulation of supernovae and other questions in stellar evolution. |
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