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

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

2009-09-03

arxiv.org/abs/0909.0618v1

MNRAS 2009, v. 400, pp 518-523

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

9 pages, 4 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2009.15484.x

The proper motions of OB-associations computed using the old (Hipparcos 1997} and new (van Leeuwen 2007) reductions of the Hipparcos data are in a good agreement with each other. The Galactic rotation curve derived from an analysis of line-of-sight velocities and proper motions of OB-associations is almost flat in the 3-kpc neighborhood of the Sun. The angular rotation velocity at the solar distance is Omega_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 (Blaha & Humphreys 1989) should be shortened by 10-20%. 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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