Revisiting the Local Kinematics of the Milky Way Based on the New Hipparcos Data

摘要

Based on the revised Hipparcos data recently released by van Leeuwen, we reexamined the kinematics in the solar neighborhood. Two different populations of objects, namely the thin-disk O-B5 stars and the thick-disk K-M giants, are selected for tracing the kinematical parameters of the Galaxy. Using a 3-D kinematical model, the components of the solar motion and the Oort constants are obtained. Comparing with previous results of other authors, we conclude that the present solution provides a more reliable estimation of the Oort constants, thanks to the revised Hipparcos data that supply even higher accurate astrometric measurements of stars.