The Lives of Stars: Insights From the TGAS-RAVE-LAMOST Dataset
  In this paper we investigate how the chemical and kinematic properties of
stars vary as a function of age. Using data from a variety of photometric,
astrometric and spectroscopic surveys, we calculate the ages, phase space
information and orbits for $\sim$125,000 stars covering a wide range of stellar
parameters.
  We find indications that the inner regions of the disk reached high levels of
enrichment early, while the outer regions were more substantially enriched in
intermediate and recent epochs. We consider these enrichment histories through
comparison of the ages of stars, their metallicities, and kinematic properties,
such as their angular momentum in the solar neighborhood (which is a proxy for
orbital radius). We calculate rates at which the velocity dispersions evolve,
investigate the Oort constants for different aged populations (finding a
slightly negative $\partial V_{C} / \partial R$ and $\partial V_{R} / \partial
R$ for all ages, being most negative for the oldest stars), as well as examine
the behavior of the velocity vertex deviation angle as a function of age (which
we find to fall from $\sim$15 degrees for the 2 Gyr aged population to $\sim$6
degrees at around 6.5 Gyr of age, after which it remains unchanged). We find
evidence for stellar churning, and find that the churned stars have a slightly
younger age distribution than the rest of the data.
