  We propose entanglement for hybrid optomechanical system consisting of
Bose-Einstein condensate (BEC) inside a single-mode high-Q Fabry-Perot cavity
with a vibrating end mirror (mechanical mirror). The intracavity field couples
the vibrating end mirror with collective atomic density of the BEC. We show
that the radiation pressure generates the stationary entanglement of three
bipartite subsystems, i.e, field-mechanical mirror, field-BEC and mechanical
mirror-atoms. The resulting entanglement is fragile with respect to
temperature.
