Synergies between Asteroseismology and Three-dimensional Simulations of Stellar Turbulence

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 arbitrarines...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2017-02, Vol.836 (2), p.L19-L19
Main Authors: Arnett, W. David, Moravveji, E.
Format: Article
Language:English
Subjects:
ALGORITHMS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Boundaries
BOUNDARY LAYERS
Chemical elements
Computer simulation
CONVECTION
ELEMENTS
Predictions
SEISMOLOGY
SIMULATION
STAR EVOLUTION
STARS
stars: general
Steepness
THREE-DIMENSIONAL CALCULATIONS
TURBULENCE
Turbulent flow
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Summary: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.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aa5cb0