Contributed Talk - Splinter Stellar

Thursday, 24 September 2020, 16:23   (virtual room M)

Convective overshooting in hydrodynamic simulations of the F-type eclipsing binary BW Aquarii

J. Pratt, I. Baraffe, M.G. Dethero
Georgia State University, University of Exeter, Georgia State University

Using a realistic stratification in density, temperature, and luminosity obtained from the MESA models of Lester and Gies (2018), we produce global multi-dimensional hydrodynamic simulations with the MUSIC code.  These MESA models were produced as a best match to the observational data for BW Aqr, but the models fail to produce the observed properties of the stars and also predict the two stars to be the same age; improvement to stellar evolution modeling is necessary to understand this particular binary pair, as well as the wealth of new stellar observations available from recent space missions. In this contribution we study the properties of non-local stellar convection and convective overshooting in both the primary and secondary star in the eclipsing binary, near the beginning of the red giant branch and the first dredge-up.  Using our recent enhanced diffusion model for convective overshooting and penetration (Pratt et al 2017) proposed for one-dimensional stellar evolution calculations, we compare the amount of mixing due to convective overshooting between these stars.