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2009MNRAS.400..518M - Mon. Not. R. Astron. Soc., 400, 518-523 (2009/November-3)

Kinematics of OB-associations and the new reduction of the Hipparcos data.


Abstract (from CDS):

The proper motions of OB-associations computed using the old and new reductions of the Hipparcos data are in good agreement with each other. The Galactic rotation curve derived from an analysis of the line-of-sight velocities and proper motions of OB-associations is almost flat in the 3-kpc neighbourhood of the Sun. The angular rotation velocity at the solar distance is Ω0= 31±1 km/s/kpc. The standard deviation of the velocities of OB-associations from the rotation curve is σ = 7.2 km/s. The distance scale for OB-associations should be shortened by 10-20 per cent. The residual velocities of OB-associations calculated for the new and old reductions differ, on average, by 3.5 km/s. The mean residual velocities of OB-associations in the stellar-gas complexes depend only slightly on the data reduction employed.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): Galaxy: kinematics and dynamics - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/MNRAS/400/518): table1.dat>

Simbad objects: 97

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