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Slowly pulsating B stars (SPB) and $\gamma$ Dor stars pulsate in high-ordergravity (g-) modes. The frequencies of g-modes are sensitive to the detailedstructure and evolution history of stars having convective cores. Recedingconvective cores in OB-type stars leave behind a chemically inhomogenous$\nabla_\mu>0$ radiative zone. Once a g-mode has radial nodes near theboundaries of these layers, the mode gets trapped and its period deviates fromasymptotic period spacing. Careful study of such trapped modes allowsconstraining the extent of such layers by fitting individual pulsationfrequencies. We employ 19 consecuitve dipole g-modes of a very rich Kepler SPBpulsator, KIC 10526294, to demonstrate the power of mode trapping in B-stars instudying the thermal and chemical stratification in the overshooting layer.

On the shape of core overshooting in stellar model computations, and asteroseismic tests