Enhanced Rotational Mixing in Massive Stars (speaker: Adam Jermyn, Institute of Astronomy, Cambridge UK)

Date: 
Monday, November 13, 12:05pm
Location: 
Marlar Lounge 37-252

Abstract:
Convection in the cores of intermediate-mass and massive stars becomes anisotropic when these stars rotate. Both this anisotropy and the centrifugal force lead to a misalignment of the thermal gradient and the thermal flux, which in turn results in baroclinicity in the upper radiative zone. I  argue that this induces a much stronger meridional flow in the radiative zone than previously thought. This leads to significantly enhanced mixing and substantially alters the evolution of these stars by enhancing core-envelope mixing. Unusually, this mixing mechanism does not yield surface abundance enhancement directly, though it may via interactions with other mixing processes.