Compact Galactic Planetary Nebulae: A HST/WFC3 Morphological Catalog,
  and a Study of their Role in the Galaxy
  We present the images of a \textit{Hubble Space Telescope}
(\textit{HST}/WFC3) snapshot program of angularly compact Galactic planetary
nebulae (PNe), acquired with the aim of studying their size, evolutionary
status, and morphology. PNe that are smaller than $\sim4\arcsec$ are
underrepresented in most morphological studies, and today they are less well
studied than their immediate evolutionary predecessors, the pre-planetary
nebulae. The images have been acquired in the light of
[\ion{O}{3}]$\lambda5007$, which is commonly used to classify the PN
morphology, in the UV continuum with the aim of detecting the central star
unambiguously, and in the $I-$band to detect a cool stellar companion, if
present. The sample of 51 confirmed PNe exhibits nearly the full range of
primary morphological classes, with the distribution more heavily weighted
toward bipolar PNe, but with total of aspherical PNe almost identical to that
of the general Galactic sample. A large range of microstructures is evident in
our sample as well, with many nebulae displaying attached shells, halos, ansae,
and internal structure in the form of arcs, rings, and spirals. Various
aspherical structures in a few PNe, including detached arcs, suggest an
interaction with the ISM. We studied the observed sample of compact Galactic
PNe in the context of the general Galactic PN population, and explore whether
their physical size, spatial distribution, reddening, radial metallicity
gradient, and possible progenitors, are peculiar within the population of
Galactic PNe. We found that these compact Galactic PNe, which have been
selected based on apparent dimensions, constitute a diverse Galactic PN
population that is relatively uniformly distributed across the Galactic disk,
including the outskirts of our Galaxy. This unique sample will be used in the
future to probe the old Galactic disk population.
