wiki:db/queries/026
Last modified 7 years ago Last modified on 02/01/2013 06:22:09 AM

Find high proper motion white dwarf candidates

SELECT objectId, ra, decl, uMag
FROM   Object
WHERE  (muRA > 0.5 OR muDecl > 0.5)
   AND rMag > 18.0
   AND gMag-rMag < 0.2
   AND extendedParam < 0.2

Comment: A new paper on white dwarfs in SDSS DR5 just came out and they do a selection with:

-2 < ugColor < 0.833 - 0.667*grColor and -2 < grColor < 0.2
      OR
0.2 < grColor < 1.0 and |riColor - 0.363*grColor| > 0.1 and ugColor < 0.7 or ugColor  < 2.5*grColor - 0.5

The first box gets most of the white dwarfs, and the second box gets white dwarfs with (unresolved) M dwarf companions.