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arXiv 0909.0618astro-ph.GA
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OB-associations的动力学和依巴谷数据的新简化

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

A. M. Melnik, A. K. Dambis

摘要:

利用依巴谷数据的旧约化(Hipparcos 1997)和新约化(van Leeuwen 2007)计算的OB-星协的自行彼此吻合得很好。银河系的自转曲线从分析的视线速度和自行的OB-协会是几乎平坦的3-kpc附近的太阳。在太阳距离上的角速度为Omega_0=31 +/-1 km s-1 kpc-1。OB星协的速度与自转曲线的标准偏差为sigma=7.2 km s-1。OB协会的距离尺度(Blaha & Humphreys 1989)应缩短10- 20%。新的和旧的减少计算的OB-协会的剩余速度不同,平均,由3.5公里s-1。在恒星气体复合体中,OB-星协的平均剩余速度仅略微依赖于所采用的数据简化。

英文摘要:

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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