  The paper deals with collapse dynamics of a spherically symmetric massive
star in the framework of non-equilibrium themodynamic prescription through
particle creation mechanism. The matter content in the star is in the form of
perfect uid with barotropic equation of state and the dissipative phenomena due
to non-equilibrium thermodynamics is in the form of bulk viscosity. For
simplicity, the thermodynamic system is chosen to be adiabatic (i.e.,
isentropic) so that the effective bulk viscous pressure is linearly related to
the particle creation rate. As a result, the evolution of the collapsing star
also depends on the particle creation rate. By proper choice of creation rate
as a function of the Hubble parameter, it is found that the end state of the
collapse may be either a black hole or a naked singularity.
