  Abundance analyses of stars with planets have revealed that their
metallicities are enhanced relative to field stars. Such a trend was originally
suggested to be due to accretion of iron-rich planetary material. Based on this
assumption, we have developed a stellar evolution code to model stars with
non-uniform metallicity distributions. We have calculated ``polluted'' stellar
evolution tracks for stars with M=0.9-1.2 M_sun. Our models encompass a range
of initial metal content from Z=0.01 to 0.03, and include metallicity
enhancements within the stellar convection zone corresponding to
Delta-Z=0.005-0.03. We find that the primary effects of metal enhancement on
stellar structure and evolution are expansion of the convection zone and
downward shift of effective temperature. In addition, we have computed the
surface metallicities expected for stars of different mass for fixed quantities
of pollution; there appears to be no correlation with present observational
data on the metallicities of stars known to harbor planets.
