Improving 1D Stellar Models with 3D Atmospheres

Jakob Rørsted Mosumgaard; Víctor Silva Aguirre; Achim Weiss; Jørgen Christensen-Dalsgaard; Regner Trampedach

doi:10.1051/epjconf/201716003009

Proceedings

Open Access

EPJ Web of Conferences 160, 03009 (2017)
https://doi.org/10.1051/epjconf/201716003009

Improving 1D Stellar Models with 3D Atmospheres

Jakob Rørsted Mosumgaard¹^⋆, Víctor Silva Aguirre¹, Achim Weiss², Jørgen Christensen-Dalsgaard¹ and Regner Trampedach³^,1

¹ Stellar Astrophysics Centre (SAC), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus C, DK-8000 Denmark
² Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, Garching, D-85748 Germany
³ Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO, 80301 USA

^⋆ e-mail: jakob@phys.au.dk

Published online: 27 October 2017

Abstract

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

Note to the reader: the article 03009 has been corrected on November 17, 2017. A note has been added to Figure 1.

© Owned by the authors, published by EDP Sciences, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).