Kinematic analysis of solar-neighborhood stars based on RAVE4 data

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• 作者：V. V. Bobylev ; A. T. Bajkova
• 关键词：radial velocities ; proper motions of stars ; distances ; stellar streams ; Galactic kinematics
• 刊名：Astronomy Letters
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：42
• 期：2
• 页码：90-99
• 全文大小：864 KB
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• 作者单位：V. V. Bobylev (1)
  A. T. Bajkova (1)
  
  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astrophysics
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-6873

文摘

We consider stars with radial velocities, proper motions, and distance estimates from the RAVE4 catalogue. Based on a sample of more than 145 000 stars at distances r < 0.5 kpc, we have found the following kinematic parameters: \({\left( {U,{\kern 1pt} V,{\kern 1pt} W} \right)_ \odot }\) = (9.12, 20.80, 7.66) ± (0.10, 0.10, 0.08) km s−1, Ω₀ = 28.71 ± 0.63 km s−1 kpc−1, and Ω₀ ’ = −4.28 ± 0.11 km s−1 kpc−2. This gives the linear rotation velocity V ₀ = 230 ± 12 km s−1 (for the adopted R ₀ = 8.0 ± 0.4 kpc) and the Oort constants A = 17.12 ± 0.45 km s−1 kpc−1 and B = −11.60 ± 0.77 km s−1 kpc−1. The 2D velocity distributions in the UV, UW, and VW planes have been constructed using a local sample, r < 0.25 kpc, consisting of ~47 000 stars. A difference of the UV velocity distribution from the previously known ones constructed from a smaller amount of data has been revealed. It lies in the fact that our distribution has an extremely enhanced branch near the Wolf 630 peak. A previously unknown peak at (U, V) = (−96, −10) km s−1 and a separate new feature in the Wolf 630 stream, with the coordinates of its center being (U, V) = (30, −40) km s−1, have been detected.