  We present atmospheric parameters and Fe abundances derived for the majority
of dwarf stars (north of -30 degrees declination) which are up to now known to
host extrasolar planets. High-resolution spectra have been obtained with the
Sandiford Echelle spectrograph on the 2.1m telescope at the University of Texas
McDonald Observatory. We have used the same model atmospheres, atomic data and
equivalent width modeling program for the analysis of all stars. Abundances
have been derived differentially to the Sun, using a solar spectrum obtained
with Callisto as the reflector with the same instrumentation. A similar
analysis has been performed for a sample of stars for which radial velocity
data exclude the presence of a close-in giant planetary companion. The results
are compared to the recent studies found in the literature.
