2009/09/03 by A. M. Melnik, A. K. Dambis · 2 citations
Physics and Astronomy · #Astrophysics and Star Formation Studies #Solar and Space Plasma Dynamics #Stellar, planetary, and galactic studies #astro-ph.GA
paper · pdf · doi:10.1111/j.1365-2966.2009.15484.x
published as MNRAS 2009, v. 400, pp 518-523 · 9 pages, 4 figures, accepted for publication in MNRAS
arxiv created 2009/09/03 · openalex publication_date 2009/10/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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−1 kpc−1. The standard deviation of the velocities of OB-associations from the rotation curve is σ= 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.