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Internal mixing of rotating stars inferred from dipole gravity modes

Lookup NU author(s): Professor Tamara Rogers, Dr Dominic BowmanORCiD

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Abstract

© 2021, The Author(s), under exclusive licence to Springer Nature Limited.During most of their life, stars fuse hydrogen into helium in their cores. The mixing of chemical elements in the radiative envelope of stars with a convective core is able to replenish the core with extra fuel. If effective, such deep mixing allows stars to live longer and change their evolutionary path. Yet localized observations to constrain internal mixing are absent so far. Gravity modes probe the deep stellar interior near the convective core and allow us to calibrate internal mixing processes. Here we provide core-to-surface mixing profiles inferred from observed dipole gravity modes in 26 rotating stars with masses between 3 and 10 solar masses. We find a wide range of internal mixing levels across the sample. Stellar models with stratified mixing profiles in the envelope reveal the best asteroseismic performance. Our results provide observational guidance for three-dimensional hydrodynamical simulations of transport processes in the deep interiors of stars.

Publication metadata

Author(s): Pedersen MG, Aerts C, Papics PI, Michielsen M, Gebruers S, Rogers TM, Molenberghs G, Burssens S, Garcia S, Bowman DM

Publication type: Article

Publication status: Published

Journal: Nature Astronomy

Year: 2021

Volume: 5

Pages: 715-722

Print publication date: 01/07/2021

Online publication date: 10/05/2021

Acceptance date: 19/03/2021

ISSN (electronic): 2397-3366

Publisher: Nature Research

URL: https://doi.org/10.1038/s41550-021-01351-x

DOI: 10.1038/s41550-021-01351-x

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