Stellar models with calibrated convection and temperature stratification from 3D hydrodynamics simulations

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Stellar evolution codes play a major role in present-day astrophysics, yet they share common simplifications related to the outer layers of stars. We seek to improve on this by the use of results from realistic and highly detailed 3D hydrodynamics simulations of stellar convection. We implement a temperature stratification extracted directly from the 3D simulations into two stellar evolution codes to replace the simplified atmosphere normally used. Our implementation also contains a non-constant mixing-length parameter, which varies as a function of the stellar surface gravity and temperature - also derived from the 3D simulations. We give a detailed account of our fully consistent implementation and compare to earlier works, and also provide a freely available MESA-module. The evolution of low-mass stars with different masses is investigated, and we present for the first time an asteroseismic analysis of a standard solar model utilizing calibrated convection and temperature stratification from 3D simulations. We show that the inclusion of 3D results has an almost insignificant impact on the evolution and structure of stellar models - the largest effect are changes in effective temperature of order 30K seen in the pre-main sequence and in the red-giant branch. However, this work provides the first step for producing self-consistent evolutionary calculations using fully incorporated 3D atmospheres from on-the-fly interpolation in grids of simulations.

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume478
Issue4
Pages (from-to)5650–5659
Number of pages10
ISSN0035-8711
DOIs
Publication statusPublished - Aug 2018

    Research areas

  • asteroseismology, stars: atmospheres, stars: evolution, stars: interiors, stars: solar-type, EQUATION-OF-STATE, MIXING-LENGTH, SOLAR-TYPE, OSCILLATION FREQUENCIES, RED GIANTS, SURFACE, INTERPOLATION, ENVELOPES, OPACITIES, STARS

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