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Galactic Rotation Derived from OB Stars Using Hipparcos Proper Motions and Radial Velocities

Uemura, Makoto; Kato, Taichi; Hirata, Ryuko +3 more

We have examined the systematic velocity field of the solar neighborhood, based on Hipparcos (HIgh Precision PARallax COllecting Satellite) proper motions and ground-based radial velocities of about 240 O-B5 stars. The distances of these stars were derived from either Hipparcos parallaxes or the SKYMAP compilation of the spectroscopic parallaxes. …

Kinematics of the Galaxy from Hipparcos Proper Motions

Zhu, Zi

From Hipparcos proper motions, we have analysed the local kinematics of the Milky Way from young O-B5 stars, classical Cepheids, and the late-type K-M giants. The components of solar motion along the direction pointing to the galactic center from the Sun u_0 and along the direction pointing to the north galactic pole w_0 are approximately 10 km s<…