Galactic kinematics derived from Hipparcos proper motions.

Details Galactic kinematics derived from Hipparcos proper motions. Galactic kinematics derived from Hipparcos proper motions.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pyuno....s.231z&link_type=abstract

Publications of the Yunnan Observatory, Suppl. 1999, p. 231 - 234

Computer Science

Ob Stars: Proper Motions, Galaxy: Kinematics, Galaxy: Rotation, Kinematics: Cepheids

Scientific paper

Analyzing Hipparcos proper motions of 1352 O-B5 stars, the author has found a clear stellar warping-motion that is a systematic rotation +3.8±1.1 km s-1kpc-1 of stars about the axis pointing to the glactic center in the sense of increasing the inclination of the H I warp, and a remarkably large galactic rotation of (V0)O - B5 = 268.7±11.9 km s-1, compared with the IAU recommendation (V0 = 220±20 km s-1), given the galactocentric distance of the sun R0 = 8.5 kpc. Combining Hipparcos proper motions and the radial velocity data, the author has then studied the kinematics for 151 classical cepheids. The results show a contracting motion of the Galaxy in the solar neighbourhood. In the present paper, the author has also analyzed proper motions of 21000 K - M giants, and again he found a large galactic rotation (V0)K - M = 252.6±9.5 km s-1.

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