太阳邻域恒星速度场的特性分析
Analysis of Peculiarities of the Stellar Velocity Field in the Solar Neighborhood
摘要：
基于新版本的依巴谷星表和更新的日内瓦-哥本哈根F矮星和G矮星巡天，我们分析了太阳附近约17000颗单星的空间速度场。已知的主要团块、溪流和分支（昂宿星团、毕宿星团、天狼星、后发座、武仙座、狼630-α鲸鱼座和大角星）已经使用各种方法被识别出来。F型和G型矮星的空间速度场的演化是恒星年龄的函数。我们已经设法证实了最近发现的KFR 08流的存在。我们已经发现了19依巴谷星，候选人的成员在KFR 08流，并获得了等时线年龄估计流，13 Gyr。狼630-α鲸鱼座和武仙座星流的平均恒星年龄是相当的，4- 6 Gyr。属于这些流的恒星在金属丰度上没有发现明显的差异，这为这些流的起源于一个共同机制的假说提供了论据。
英文摘要：
Based on a new version of the Hipparcos catalogue and an updated Geneva-Copenhagen survey of F and G dwarfs, we analyze the space velocity field of about 17000 single stars in the solar neighborhood. The main known clumps, streams, and branches (Pleiades, Hyades, Sirius, Coma Berenices, Hercules, Wolf 630-alpha Ceti, and Arcturus) have been identified using various approaches. The evolution of the space velocity field for F and G dwarfs has been traced as a function of the stellar age. We have managed to confirm the existence of the recently discovered KFR08 stream. We have found 19 Hipparcos stars, candidates for membership in the KFR08 stream, and obtained an isochrone age estimate for the stream, 13 Gyr. The mean stellar ages of the Wolf 630-alpha Ceti and Hercules streams are shown to be comparable, 4--6 Gyr. No significant differences in the metallicities of stars belonging to these streams have been found. This is an argument for the hypothesis that these streams owe their origin to a common mechanism.
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