Distant halo giants using PS1 (incl. proper motions)

Can we use PS1 & (who else?) WISE colors to identify distant halo giants,
using PS1 to weed-out proper motions?
We want tip-of-the-RGB stars that are bright enough for good follow-up, i.e. m_r<19.5,
which should also provide good PM constraints.
What are the candidate source densities?

Things to be checked:
   -- to what distance do we reach with such constraints
   -- what IR photometry coverage do we have and how useful are these colors
   -- what PM do we expect?
   -- probably use either galaxy or Besancon models to explore
 

Value-added information in the APOGEE survey to get stellar ages

This issue came up in the context off what Gaia and Apogee synergies could hold, and in particular on the question of whether Apogee should change its targeting strategy or observation sequence to get better age information.
The two avenues I have pursued are:
 -Observations and targeting of stars on the sub giant-branch with Apogee
 -Repeat observations of giants within 2 parsecs, to compliment astrometric binary orbit solutions with two epoch velocities; A good orbit solution would yield a direct dynamical estimate of the giant mass, thereby constraining its age.

Next actions:
HWR should do estimates over holiday break, so as to present initial results at Seattle, Jan 9, 2015.

Define directions a low latitude

Look up APOGEE target selection criteria

get Besancon models for such criteria

estimate dynamical orbit distances and parallax accuracies