Analysis of peculiarities of the stellar velocity field in the solar neighborhood

作者：Bobylev V V^*; Bajkova A T; Myllari A A

来源：Astronomy Letters, 2010, 36(1): 27-43.

DOI：10.1134/S1063773710010044

• kinematics
• stellar streams
• Arcturus stream
• KFR08 stream
• Galaxy (Milky Way)

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 a parts per thousand 17 000 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.

• 出版日期2010-1