Enhanced rotational mixing in the radiative zones of massive stars
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Authors
Jermyn, AS
Tout, CA
Chitre, SM
Publication Date
2018Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
Publisher
Oxford University Press (OUP)
Volume
480
Issue
4
Pages
5427-5446
Type
Article
Metadata
Show full item recordCitation
Jermyn, A., Tout, C., & Chitre, S. (2018). Enhanced rotational mixing in the radiative zones of massive stars. Monthly Notices of the Royal Astronomical Society, 480 (4), 5427-5446. https://doi.org/10.1093/MNRAS/STY1831
Abstract
Convection in the cores of massive stars becomes anisotropic when they
rotate. This anisotropy leads to a misalignment of the thermal gradient and the
thermal flux, which in turn results in baroclinicity and circulation currents
in the upper radiative zone. We show that this induces a much stronger
meridional flow in the radiative zone than previously thought. This drives
significantly enhanced mixing, though this mixing does not necessarily reach
the surface. The extra mixing takes on a similar form to convective
overshooting, and is relatively insensitive to the rotation rate above a
threshold, and may help explain the large overshoot distances inferred from
observations. This has significant consequences for the evolution of these
stars by enhancing core-envelope mixing.
Keywords
stars - evolution, stars - interiors, stars - rotation
Identifiers
External DOI: https://doi.org/10.1093/MNRAS/STY1831
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286187
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