We examine how metallicity affects convection and overshoot in the superadiabatic layer of main sequence stars .
We present results from a grid of 3D radiation hydrodynamic simulations with four metallicities ( Z = 0.040 , 0.020 , 0.010 , 0.001 ) , and spanning a range in effective temperature ( 4950 < T _ { eff } < 6230 ) .
We show that changing the metallicity alters properties of the convective gas dynamics , and the structure of the superadiabatic layer and atmosphere .
Our grid of simulations show that the amount of superadiabaticity , which tracks the transition from efficient to inefficient convection , is sensitive to changes in metallicity .
We find that increasing the metallicity forces the location of the transition region to lower densities and pressures , and results in larger mean and turbulent velocities throughout the superadiabatic region .
We also quantify the degree of convective overshoot in the atmosphere , and show that it increases with metallicity as well .