Effects of rotation on stellar structure: rotation induced mixing

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Scientific paper

Standard models of stellar structure are unable to account for various observational facts, such as the appearance at the surface of chemical elements that have been produced in the nuclear core. Thus there is now a large consensus that some ‘extra mixing’ must occur in the radiation zones. This mixing is achieved mainly through the shear-turbulence generated by the differential rotation, which itself results from the transport of angular momentum by a large-scale circulation that is induced either by the structural adjustments accompanying the evolution or by the applied torques (stellar wind, accretion, tides). These processes are now being implemented in stellar evolution codes, and they provide a much better agreement with the observations.

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