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On the Chemical Mixing Induced by Internal Gravity Waves (IGW)

Lookup NU author(s): Professor Tamara Rogers

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

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.

Publication metadata

Author(s): Rogers TM, McElwaine JN

Publication type: Article

Publication status: Published

Journal: The Astrophysical Journal Letters

Year: 2017

Volume: 848

Issue: 1

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

URL: http://doi.org/10.3847/2041-8213/aa8d13

DOI: 10.3847/2041-8213/aa8d13

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