Identification of moving groups from a sample of B, A and F type stars.
Abstract
An algorithm to find moving groups has been developed and applied to a sample of 1924 B, A, and F main sequence stars, basically extracted from the Hipparcos Input Catalogue. This algorithm uses a nonparametric kernel estimator to describe the stellar distribution in a 4dimensional space of velocities and age, although it can be used to detect the real clustering structure in an ndimensional space automatically. Four moving groups near the Sun (Pleiades, Sirius, Hyades, IC 2391) have been identified without assuming any a priori knowledge of moving groups, neither the velocity distribution nor other physical properties. This provides objective evidence of the existence of the moving groups, and we find that about 26% of our sample belongs to such stellar streams. For the remaining field stars we obtain a mean motion of the Sun respect to the Local Standard of Rest (U,V,W)=(13.4+/0.4, 11.1+/0.3, 6.9+/0.2)km/s.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 February 1997
 Bibcode:
 1997A&A...318...29C
 Keywords:

 STARS: EARLYTYPE;
 STARS: STATISTICS;
 (GALAXY): SOLAR NEIGHBOURHOOD;
 STARS: KINEMATICS