Stars in the local galactic thick disc and halo in Gaia EDR3: a catalogue of half a million local main-sequence stars with photometric metallicities

ABSTRACT We present a catalogue of 551 214 main-sequence stars in the local (d < 2 kpc) Galactic thick disc and halo, based on search with large proper motions ($\mu _{\rm tot} \gt 40.0~\rm mas\, yr^{-1}$) Gaia Early Data Release 3. derive photometric metallicity calibrated from colour–luminosity–metallicity distribution 20 047 spectroscopic metallicities, collected various surveys, including SDSS SEGUE/APOGEE, GALAH DR3, LAMOST DR6. combine these results to construct an empirical colour–magnitude–metallicity grid, which can be used estimate metallicities for low-mass metal-poor K M subtypes their absolute G magnitude colour values. find that low-mass, high-velocity our share similar kinematics as reported recent studies more luminous halo stars. The pseudo-kinematic analysis sample recovers main structures, Gaia–Enceladus Stream Helmi stream; aside these, appear show remarkably smooth velocity space. Since future data release will provide radial measurements only small number sample, provides targets high interest observation programs.