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Lookup NU author(s): Dr Ashlin Varghese, Rathish Ratnasingam, Dr Riccardo Vanon, Dr Philipp EdelmannORCiD, Professor Tamara Rogers
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023. The Author(s). Published by the American Astronomical Society. Internal gravity waves can cause mixing in the radiative interiors of stars. We study this mixing by introducing tracer particles into 2D hydrodynamic simulations. Following the work of Rogers & McElwaine, we extend our study to different masses (3, 7, and 20 M ⊙) and ages (ZAMS, midMS, and TAMS). The diffusion profiles of these models are influenced by various parameters such as the Brunt-Väisälä frequency, density, thermal damping, the geometric effect, and the frequencies of waves contributing to these mixing profiles. We find that the mixing profile changes dramatically across age. In younger stars, we noted that the diffusion coefficient increases toward the surface, whereas in older stars the initial increase in the diffusion profile is followed by a decreasing trend. We also find that mixing is stronger in more massive stars. Hence, future stellar evolution models should include this variation. In order to aid the inclusion of this mixing in 1D stellar evolution models, we determine the dominant waves contributing to these mixing profiles and present a prescription that can be included in 1D models.
Author(s): Varghese A, Ratnasingam RP, Vanon R, Edelmann PVF, Rogers TM
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal
Year: 2023
Volume: 942
Issue: 1
Online publication date: 10/01/2023
Acceptance date: 05/11/2022
Date deposited: 31/01/2023
ISSN (print): 0004-637X
ISSN (electronic): 1538-4357
Publisher: Institute of Physics Publishing, Inc.
DOI: 10.3847/1538-4357/aca092
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