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Mixing in Low-mass stars

Thermohaline Mixing In Low-Mass Red Giants

We present the results of our 2D and 3D numerical simulations of thermohaline convection in low-mass red giant branch (RGB) stars. This convection is driven by the double-diffusive instability associated with the inversion of the mean molecular weight distribution caused by the reaction 3He(3He,2p)4He in the vicinity of the hydrogen burning shell.

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A model of magnetic braking of solar rotation

In the presence of differential rotation, a seed poloidal magnetic field can be wound up into a strong toroidal field. In this case, the azimuthal component of the magnetic tension term of the Lorentz force can break the original differential rotation. We use comsol to solve the corresponding MHD equations in a 2D geometry and show that under certain circumstances this mechanism can explain the rotational braking of solar-type stars.

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