Synergies between Asteroseismology and Three-dimensional Simulations of Stellar Turbulence

W. David Arnett, E. Moravveji

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Turbulent mixing of chemical elements by convection has fundamental effects on the evolution of stars. The standard algorithm at present, mixing-length theory (MLT), is intrinsically local, and must be supplemented by extensions with adjustable parameters. As a step toward reducing this arbitrariness, we compare asteroseismically inferred internal structures of two Kepler slowly pulsating B stars (SPBs; ) to predictions of 321D turbulence theory, based upon well-resolved, truly turbulent three-dimensional simulations that include boundary physics absent from MLT. We find promising agreement between the steepness and shapes of the theoretically predicted composition profile outside the convective region in 3D simulations and in asteroseismically constrained composition profiles in the best 1D models of the two SPBs. The structure and motion of the boundary layer, and the generation of waves, are discussed.

Original languageEnglish (US)
Article numberL19
JournalAstrophysical Journal Letters
Volume836
Issue number2
DOIs
StatePublished - Feb 20 2017

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Keywords

  • convection
  • stars: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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