Constraints on Convection and Overshoot

Convection is one of the major mixing processes in stars, and is crucial for understanding their structure and evolution. One area of uncertainty is the amount of convective mixing that extends beyond the convective boundary, described by the convective overshoot parameter. This extra mixing effectively extends the convective region, changing the properties of the star. However, these processes occur in the deep interior of the star, and cannot be observed directly. For this reason, the extent of the overshoot region is highly uncertain, and whether and how it changes with the stellar properties is unknown. The overshoot parameter can be determined using its effects on the pulsation frequencies of a star, but the detailed modelling required has only been done for a few stars. In this talk, I will summarize how we determine convective overshoot in stars, and what this tells us about the behaviour of the convective overshoot parameter