Improving 1D Stellar Models with 3D Atmospheres

摘要

Stellar evolution codes play a major role in present-day astrophysics, yetthey share common issues. In this work we seek to remedy some of those by theuse of results from realistic and highly detailed 3D hydrodynamical simulationsof stellar atmospheres. We have implemented a new temperature stratificationextracted directly from the 3D simulations into the Garching Stellar EvolutionCode to replace the simplified atmosphere normally used. Secondly, we haveimplemented the use of a variable mixing-length parameter, which changes as afunction of the stellar surface gravity and temperature -- also derived fromthe 3D simulations. Furthermore, to make our models consistent, we havecalculated new opacity tables to match the atmospheric simulations. Here, wepresent the modified code and initial results on stellar evolution using it.