Institute of Astronomy

A new generation of multi-dimensional stellar structure models

SpeakerTalk DateTalk Series
Isabelle Baraffe (University of Exeter)11 May 2017Institute of Astronomy Colloquia

Abstract

I will present the recent development of multi-dimensional stellar structure models based on a fully compressible hydrodynamical time implicit code, the MUSIC code, devoted to stellar and planetary interiors. I will discuss the main challenges in the computations of multi-dimensional stellar structures and some of the advantages of our approach with MUSIC for the study of stellar fluid dynamics problems. MUSIC is interfaced with our stellar evolution code and with MESA, which provide initial 1D stellar structures for any type of star and allow exploration of a wide range of stellar phases and masses. I will present our first applications to a variety of problems, in particular the study of accretion's effect on the structure of very young low mass stars and the problem of convection and overshooting in pre-MS stars.  I will show the success of our approach with MUSIC for the treatment of overshooting  within the context of lithium depletion in the Sun and in solar-like stars. A major motivation for these studies is to derive new prescriptions to be implemented in stellar evolution codes and  to improve stellar evolution models that are widely used in stellar and galactic astrophysics.

Presentation