KINEMATIC SURVEY OF HALO STARS FROM SDSS-DR2 ∩ GSC2

摘要

We present a new sample of blue subdwarfs within a few kpc of the Sun assembled from the cross-matching of SDSS-DR2 and GSC2. By means of the astrometric, photometric and spectroscopic data, we estimate distances and velocities that we use to investigate the kinematics in the inner halo and search for substructures, possible fossil signatures of past merging events.