Range of mean super adiabaticity ( ⟨ ∇T ⟩ − ∇ad) of a semiconvective medium as a function of the mixing length parameter α = l/HP, for (gray area between the red dashed curves; Φ0 = 3 × 1033; εd = 10; CL = 1). For comparison, the super adiabaticity in a convective (pale red area; same parameters) and in a diffusive cell (dotted curve) are also shown. As expected a smooth transition between the convective and diffusive regimes occurs near αcrit (see Appendix A; here αcrit ≈ 2 × 10-9).
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