Galactic warping motion from Hipparcos proper motions and radial velocities

Details Galactic warping motion from Hipparcos proper motions and radial velocities Galactic warping motion from Hipparcos proper motions and radial velocities

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..244z&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

Galactic Disk, Kinematics

Scientific paper

Based on the Hipparcos proper motions and the available radial velocity data of O-B stars, we have reexamined the local kinematical structure of young disk population of ~1500 O-B stars other than the Gould-belt stars. A systematic warping motion of stars about the axis pointing to the Galactic center has been reconfirmed. A negative K-term has been detected that is a systematic contraction of stars in the solar vicinity. Two different distance scales have been accepted in order to inspect their impact on the kinematical parameters to be determined. We conclude that the adopted distance scale plays a certain role in characterizing the kinematical parameters at the present level of the measurement uncertainty.

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