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The Eeect of Diiusion on Pulsation of F and a Stars

The eeect of diiusion on the pulsations of main-sequence A and F stars is reviewed with a particular attention to Am, Doradus and Boo-tis stars. The discussion is made in the light of new models incorporating a consistent treatment of diiusion and its eeect on stellar structure. In addition to the variation of abundances in the driving regions associated with hydrogen, helium and metals, the new models show that diiusion can have a signiicant eeect on the depth of the superrcial con-vection zone in these stars. Comparisons to observable properties of these stars, including pulsations, provide constraints on the depth of the mixing below the convection zone.