Enhanced rotational mixing in the radiative zones of massive stars
Monthly Notices of the Royal Astronomical Society
Oxford University Press (OUP)
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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
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.
External DOI: https://doi.org/10.1093/MNRAS/STY1831
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286187