期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 52, 期 1, 页码 143-151出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/52.1.143
关键词
stars : kinematics; Galaxy : kinematics and dynamics; solar neighborhood
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. Using a first-order approximation: we obtained the galactic rotation at the solar vicinity of V-theta = 255.52 +/- 8.33 km s(-1) assuming the galactocentric distance of the Sun, R. = 8.5 kpc. The slope of the galactic-rotation curve is given by (partial derivative V-theta/partial derivative R)(R.) = -1.98+/-0.98 km s(-1) kpc(-1), and the rotation about the axis pointing to the galactic center is -R(-1)partial derivative V-z/partial derivative theta = 1.33 +/- 0.90 km s(-1) kpc(-1) Our sample shows neither expansion nor contraction with respect to the Local Standard of Rest (LSR).
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