Abstract
Considering a Vaidya exterior spacetime, we study dynamical models ofprototype gravastars, made of an infinitely thin spherical shell of aperfect fluid with the equation of state p = σ, enclosing an interior de Sitter spacetime. We show explicitly that the final output can be a blackhole, an unstable gravastar, a stable gravastar or a "bounded excursion" gravastar, depending on how the mass of the shell evolves in time, the cosmological constant and the initial position of the dynamical shell.This work presents, for the first time in theliterature, a gravastar that emits radiation.
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