  With the Spitzer-IRS we have obtained the first mid-IR spectroscopy of NGC
7129, in the unusually strong outflow and in a ridge of H_2 emission near the
Herbig Be star LkHalpha-234. The UV radiation field strength is estimated from
PAH band intensities in the H_2 ridge, and from the rotational H_2 emission
lines we have deduced aperture average excitation temperatures and column
densities in the two regions, finding the H_2 ridge values to be consistent
with pumping by UV fluorescence, but also comparable to regions that form H_2
in non-dissociative C-shocks. The H_2 emission in the outflow is consistent
with formation by collisional excitation in J-shocks, with shock velocities of
10 - 30 km/sec. A photodissociating component may be present in the outflow, by
similarity of S(0) line intensities in both regions. There is no indication of
warm dust in the outflow. We also present the first 16um imaging of a Galactic
nebula using the unique imaging capabilities of the IRS, and combine with
ground-based 2.12um (H_2 1-0 S(1)) imaging. Candidate pre-main sequence objects
are clearly evident in these data. We also find extended emission not
previously observed around the young B star BD+65 1638, ~22'' across, showing
that the region is not free of material as otherwise inferred by recent high
angular resolution mapping at submillimeter wavelengths. The presence of this
material complicates interpretation of the surrounding CO cavity and origin(s)
of the photodissociated region, and further spectroscopic observations are
needed to characterize its nature.
