Non-adiabatic effect on convective mode

Abstract A systematic analysis of the non-adiabatic effect on convective mode has been conducted using the wave energy relation. In the adiabatic analysis, the “propagation diagram” for convective mode is proposed as a useful tool to see its behavior. In the non-adiabatic analysis, it is found that, for a strongly non-adiabatic case, a monotonically growing convective mode becomes oscillatory. In this phase, the radial displacement and the distribution of wave energy show only one bump, in which the distribution of entropy energy $e_S$ almost overlaps with the distribution of gravity energy $e_g$. Entropy energy $e_S$ seems to act as the potential energy of oscillatory convection. In addition to this, this change occurs not gradually, but abruptly with a change of non-adiabatic indicator.