Stellar evolution of low and intermediate-mass stars. IV. Hydrodynamically-based overshoot and nucleosynthesis in AGB stars

TL;DR

This paper investigates hydrodynamically-based overshoot and nucleosynthesis in AGB stars, applying hydrodynamical simulation results to improve stellar evolution models of low and intermediate-mass stars.

Contribution

It introduces a new treatment of convective overshoot based on hydrodynamical simulations for AGB star models, enhancing the understanding of mixing and nucleosynthesis.

Findings

Extended convective mixing beyond traditional boundaries.

Improved predictions of nucleosynthesis yields.

Enhanced stellar evolution models for AGB stars.

Abstract

The focus of this study is on the treatment of those stellar regions immediately adjacent to convective zones. The results of hydrodynamical simulations by Freytag et al. (1996, A&A313,497) show that the motion of convective elements extends well beyond the boundary of the convectively unstable region. We have applied their parametrized description of the corresponding velocities to the treatment of overshoot in stellar evolution calculations up to the AGB (Pop.I, M_zams=3M_sun).