Rogers, T. M. and McElwaine, J. N. (2017) 'On the chemical mixing induced by internal gravity waves.', The astrophysical journal., 848 (1). L1.
Detailed modeling of stellar evolution requires a better understanding of the (magneto)hydrodynamic processes that 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 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 parameterization for this diffusion, which can be incorporated into stellar evolution codes and tested against observations.
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|Publisher Web site:||https://doi.org/10.3847/2041-8213/aa8d13|
|Publisher statement:||Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.|
|Date accepted:||13 September 2017|
|Date deposited:||18 October 2017|
|Date of first online publication:||04 October 2017|
|Date first made open access:||18 October 2017|
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