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Wednesday 20 Oct 2021 Convective Overshoot and Penetration in Stars

Daniel Lecoanet -

4th Floor, Physics + remote 16:00-17:00

Convective motions extend beyond the boundary of a convection zone, leading to additional mixing in the radiative zone. This can have important consequences for stellar evolution, including larger core masses and main sequence lifetimes of massive stars. I will review some previous work and ideas around radiative-convective interfaces. In particular, I will describe convective overshoot which causes chemical mixing, and convective penetration which causes thermodynamic mixing. I will present a series of simulations exhibiting significant convective penetration, and present mechanistic and parametric descriptions of the phenomenon. These can be implemented in stellar evolution models, and used to compare to stellar observations.

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