Improving 1D Stellar Models with 3D Atmospheres

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.

4 pages, 5 figures; submitted to the conference proceedings: Seismology of the Sun and the Distant Stars 2016

References in corpus (5)

• Up-dated opacities from the Opacity Project
• Improvements to stellar structure models, based on a grid of 3D convection simulations. II. Calibrating the mixing-length formulation
• A Grid of 3D Stellar Atmosphere Models of Solar Metallicity: I. General Properties, Granulation and Atmospheric Expansion
• Improvements to Stellar Structure Models, Based on a Grid of 3D Convection Simulations. I. $T(\tau )$-Relations
• Stellar models with mixing length and T(tau) relations calibrated on 3D convection simulations

Cited by in corpus (5)

• Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
• Solar structure and evolution
• Coupling 1D stellar evolution with 3D-hydrodynamical simulations on-the-fly II: Stellar Evolution and Asteroseismic Applications
• On the impact of the structural surface effect on global stellar properties and asteroseismic analyses
• Mixing-length estimates from binary systems. A theoretical investigation on the estimation errors