Nuno A. M. Moedas
IA / FCUP

Abstract
In stellar evolution one of the fundamental ingredients is the chemical composition. At the stellar surface, the chemical abundances change during the life of the stars due to the presence of chemical transport mechanisms. One of these processes is atomic diffusion. This process presents great success in simulating solar-type star evolution. However, for F-type stars, the inclusion of atomic diffusion shows unrealistic chemical variations at the stellar surface, indicating the need for competing transport processes. In this talk, we present the possibility of parameterizing the effects of the competing processes using turbulent mixing. We successfully found that it is possible to avoid chemical over-variations at the stellar surface. We also found that the effects of radiative acceleration in F-type stars can be reproduced using turbulent mixing. Then we explored the performance of using the parameterised turbulent mixing in the inference of the global properties from a sample of observed Kepler stars. We also compared its results with the current models that neglect atomic diffusion in F-type stars. We found that considering turbulent mixing creates a difference in the inferred age of about 10%.

2023 February 08, 13:30

IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto