Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 400, Issue 1, Pages 518-523Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15484.x
Keywords
Galaxy: kinematics and dynamics; open clusters and associations: general
Categories
Funding
- Russian Foundation for Basic Research [08-02-00738, 07-02-00380]
- Council for the Program of Support for Leading Scientific Schools [NSh-433.2008.2]
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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 (0) = 31 +/- 1 km s-1 kpc-1. The standard deviation of the velocities of OB-associations from the rotation curve is Sigma = 7.2 km s-1. 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-1. The mean residual velocities of OB-associations in the stellar-gas complexes depend only slightly on the data reduction employed.
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