Synergies between Asteroseismology and Three-dimensional Simulations of Stellar Turbulence
AffiliationUniv Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationSynergies between Asteroseismology and Three-dimensional Simulations of Stellar Turbulence 2017, 836 (2):L19 The Astrophysical Journal
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AbstractTurbulent 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; M similar to 3.25M circle dot.) 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.
VersionFinal published version
SponsorsTheoretical Program in Steward Observatory; People Programme of the European Union's Seventh Framework Programme FP7 under REA grant