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We present a numerical study of turbulence and dynamo action in stratifiedshearing boxes with zero magnetic flux. We assume that the fluid obeys theperfect gas law and has finite (constant) thermal diffusivity. We chooseradiative boundary conditions at the vertical boundaries in which the heat fluxis propor- tional to the fourth power of the temperature. We compare theresults with the corresponding cases in which fixed temperature boundaryconditions are applied. The most notable result is that the formation of afully convective state in which the density is nearly constant as a function ofheight and the heat is transported to the upper and lower boundaries byoverturning motions is robust and persists even in cases with radiativeboundary conditions. Interestingly, in the convective regime, although thediffusive transport is negligible the mean stratification does not relax to anadiabatic state.

Fully Convective Magnetorotational Turbulence in Stratified Shearing Boxes