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Lookup NU author(s): Professor Tamara Rogers
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Detailed modeling of stellar evolution requires a better understanding of the (magneto-)hydrodynamic processes which mix chemical elements and transport angular momentum. Understanding these processes is crucial if we are to accurately interpret observations of chemical abundance anomalies, surface rotation measurements and asteroseismic data. Here, we use two-dimensional hydrodynamic simulations of the generation and propagation of internal gravity waves (IGW) in an intermediate mass star to measure the chemical mixing induced by these waves. We show that such mixing can generally be treated as a diffusive process. We then show that the local diffusion coefficient does not depend on the local fluid velocity, but rather on the wave amplitude. We then use these findings to provide a simple parametrization for this diffusion which can be incorporated into stellar evolution codes and tested against observations.
Author(s): Rogers TM, McElwaine JN
Publication type: Article
Publication status: Published
Journal: The Astrophysical Journal Letters
Online publication date: 04/10/2017
Acceptance date: 13/09/2017
Date deposited: 18/09/2017
ISSN (print): 2041-8205
ISSN (electronic): 2041-8213
Publisher: Institute of Physics Publishing Ltd
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