Abstract
As part of a series of investigations aimed at understanding the adiabatic gravity-mode period structure of models of pulsating DA white dwarfs, we examine qualitatively and quantitatively the phenomenon of mode trapping caused by compositional layering in these stars. This is motivated by the real possibility that the pulsation modes detected in ZZ Ceti stars are actually trapped in the outer hydrogen layer. We first discuss the various manifestations of compositional layering on the pulsational properties of a representative ZZ Ceti star model
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