Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52..143u&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.143.
Astronomy and Astrophysics
Astronomy
13
Stars: Kinematics, Galaxy: Kinematics And Dynamics, Solar Neighborhood
Scientific paper
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, RO =8.5 kpc. The slope of the galactic-rotation curve is given by (partial V_theta / partial R)R_minisolar =-1.98+/- 0.98 km s-1 kpc-1, and the rotation about the axis pointing to the galactic center is -R-1partial V_z / partial 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).
Hayakawa Tomonori
Hirata Ryuko
Ishida Eiji
Kato Taichi
Ohashi Hiroyuki
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