\documentstyle{preprint}
\begin{document}
\title{PLANETARY NEBULAE WITH BINARY NUCLEI}
\author{Mario Livio\\
\\
Space Telescope Science Institute\\
\\
3700 San Martin Drive\\
\\
Baltimore, MD  21218}

\pub{{\em the proceedings of IAU Symposium 180}\\
~\\
Planetary Nebulae\\
~\\
{\em held 26--30 August 1996 in Groningen, The Netherlands}}

\maketitle

\begin{abstract}
High resolution images of planetary nebulae have revealed a variety of 
non-spherical morphologies.  In addition, some planetary nebulae were
found to produce highly collimated jets.  It is argued that binary
central stars may play a crucial role in the production of all of these
morphologies.  In particular, a specific mechanism is identified for the
generation of ``point-symmetric'' nebulae.  It is shown that the study of
binary nuclei of planetary nebulae can provide essential information for
the understanding of the common envelope phase in the evolution of
binary systems.
\end{abstract}
\end{document}