Topcat GPS1 exercises

This is the basic color-color locus of stars

Went to the 30deg around the anticenter,

and picked red stars with low proper motion (RA82DEC0)

among those, there are stars that are very red in r-z. If we pick those they have a distinct angular distribution away from the plane, and in W1 apparent magnitude.

What are they?

If I look at a proper motion selected sub-sample in TGAS, I see

taken  together we see (at 350 pc???

according to TGAS)

What is it?

Puzzlingly the colors are those of giants not dwarfs

Things don't quite fit with a 1Gyr isochrone

Bringing in APASSS settles it; it's a lounging stellar population at 350 pc

That's a query to look at the wide area


SELECT
   *
   FROM gps1.main as ps1
   WHERE
      1=CONTAINS(POINT('ICRS', ra, dec),
                 CIRCLE('ICRS', 82. ,0., 15.))
   AND
ps1.magi BETWEEN 13. and 19.
   and
        (ps1.magg - ps1.magr) between 1.05 and 1.40
   and
        (ps1.magr - ps1.magi) between 1.0 and 2.0
   and
(3.6e6*sqrt( power(pmra,2) + power(pmde,2))) < 7.

This is the spatial distribution of the stars (that don't move and lie on the color-mag sequence)

if we superimpose the much brighter TGAS stars (in red), we get (Y-axis flipped)