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Lookup NU author(s): Professor Tamara Rogers
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© 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.
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
Pages: epub ahead of print
Online publication date: 10/05/2021
Acceptance date: 19/03/2021
ISSN (electronic): 2397-3366
Publisher: Nature Research
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