  We present elemental abundances of 118 stars (28 of which are known
extrasolar planetary host stars) observed as part of the Anglo-Australian
Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with
previously published abundances for C and Si) are presented. This study is one
of the first to specifically examine planetary host stars for the heavy
elements produced by neutron capture reactions. We find that the host stars are
chemically different to both the standard solar abundance and non-host stars in
all elements studied, with enrichments over non-host stars ranging from 0.06
dex (for O) to 0.11 dex (for Cr and Y). Such abundance trends are in agreement
with other previous studies of field stars and lead us to conclude that the
chemical anomalies observed in planetary host stars are the result of normal
galactic chemical evolution processes. Based on this observation, we conclude
that the observed chemical traits of planetary host stars are primordial in
origin, coming from the original nebula and not from a ``pollution'' process
occurring during or after formation and that planet formation occurs naturally
with the evolution of stellar material.
