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

Varghese, Ashlin; Ratnasingam, Rathish Previn; Vanon, Riccardo; Edelmann, Philipp Valentin Ferdinand; Rogers, Tamara M.

doi:10.3847/1538-4357/aca092

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

Journal Article · Tue Jan 10 00:00:00 EST 2023 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/aca092· OSTI ID:1922023

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Newcastle University, Newcastle upon Tyne (United Kingdom)
Polish Academy of Sciences (PAS), Warszawa (Poland). Nicolaus Copernicus Astronomical Center
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Newcastle University, Newcastle upon Tyne (United Kingdom); Planetary Science Institute, Tucson, AZ (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); Science and Technology Facilities Council (STFC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1922023

Report Number(s):: LA-UR-22-27682

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 942; ISSN 0004-637X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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