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On the Chemical Mixing Induced by Internal Gravity Waves

Rogers, T.M.; McElwaine, J.N.

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Authors

T.M. Rogers



Abstract

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.

Citation

Rogers, T., & McElwaine, J. (2017). On the Chemical Mixing Induced by Internal Gravity Waves. Astrophysical Journal Letters, 848(1), Article L1. https://doi.org/10.3847/2041-8213/aa8d13

Journal Article Type Article
Acceptance Date Sep 13, 2017
Online Publication Date Oct 4, 2017
Publication Date Oct 4, 2017
Deposit Date Oct 18, 2017
Publicly Available Date Mar 29, 2024
Journal Astrophysical Journal
Print ISSN 2041-8205
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 848
Issue 1
Article Number L1
DOI https://doi.org/10.3847/2041-8213/aa8d13

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright 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.




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