Convection, Opacities and Pre-Main Sequence Lithium Depletion

Abstract

Different convection models applied to stellar structure computation provide different HR diagram locations and structural properties of stars. Theoreticians often avoid to remember that calibrating the Mixing Length Theory on the Solar Model does not allow to make predictions on convection either for other masses, or for different evolutionary phases, or for a different chemistry. Lithium depletion in pre-Main Sequence depends on the convection model and on the surface opacities in an interconnected way: it is highly dangerous to try to infer global properties on this issue until we have both very good low temperature opacities and a reliable treatment of convection.