  We present an abundance analysis of the heavy elements Zr, Ba, La, Ce, and Nd
for Hyades cluster F-K dwarfs based on high resolution, high S/N ratio spectra
from Keck/HIRES. The derived abundances show the stellar members to be highly
uniform, although some elements show a small residual trend with temperature.
The rms scatter for each element for the cluster members is as follows; Zr =
0.055 dex, Ba = 0.049 dex, Ce = 0.025 dex, La = 0.025 dex, Nd = 0.032 dex. This
is consistent with the measurement errors, and implies that there is little or
no intrinsic scatter among the Hyades members. Several stars thought to be
non-members of the cluster based on their kinematics are found to deviate from
the cluster mean abundances by about 2sigma. Establishing chemical homogeneity
in open clusters is the primary requirement for the viability of chemically
tagging Galactic disk stars to common formation sites, in order to unravel the
dissipative history of early disk formation.

Astrophysics