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Chemical Mixing Induced by Internal Gravity Waves in Intermediate-mass Stars

Lookup NU author(s): Ashlin Varghese, Rathish Ratnasingam, Dr Riccardo Vanon, Dr Philipp EdelmannORCiD, 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

© 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.


Publication metadata

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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Funding

Funder referenceFunder name
NNX17AB92G
ST/L005549/1STFC (formerly PPARC)
ST/K000373/1
ST/R001014/1
ST/R002363/1

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