Dynamically Tagged Groups of Metal-Poor Stars II. The Radial Velocity
  Experiment Data Release 6
  Orbital characteristics based on Gaia Early Data Release 3 astrometric
parameters are analyzed for ${\sim} 8,000$ metal-poor stars ([Fe/H] $\leq
-0.8$) compiled from the RAdial Velocity Experiment (RAVE) Data Release 6.
Selected as metal-poor candidates based on broadband photometry, RAVE collected
moderate-resolution ($R \sim 7,500$) spectra in the region of the Ca triplet
for these stars. About $20\%$ of the stars in this sample also have
medium-resolution ($1,200 \lesssim R \lesssim 2,000$) validation spectra
obtained over a four-year campaign from $2014$ to $2017$ with a variety of
telescopes. We match the candidate stars to photometric metallicity
determinations from the Huang et al. recalibration of the Sky Mapper Southern
Survey Data Release 2. We obtain dynamical clusters of these stars from the
orbital energy and cylindrical actions using the \HDBSCAN ~unsupervised
learning algorithm. We identify $179$ Dynamically Tagged Groups (DTGs) with
between $5$ and $35$ members; $67$ DTGs have at least $10$ member stars. Milky
Way (MW) substructures such as Gaia-Sausage-Enceladus, the Metal-Weak Thick
Disk, the Splashed Disk, Thamnos, the Helmi Stream, and LMS-1 (Wukong) are
identified. Associations with MW globular clusters are determined for $10$
DTGs; no recognized MW dwarf galaxies were associated with any of our DTGs.
Previously identified dynamical groups are also associated with our DTGs, with
emphasis placed on their structural determination and possible new
identifications. We identify chemically peculiar stars as members of several
DTGs; we find $22$ DTGs that are associated with \textit{r}-process-enhanced
stars. Carbon-enhanced metal-poor (CEMP) stars are identified among the targets
with available spectroscopy, and we assign these to morphological groups
following the approach given by Yoon et al.
