Analysis of Peculiarities of the Stellar Velocity Field in the Solar Neighborhood

Abstract

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.

23 pages, 9 figures

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Cited by in corpus (15)

• Elemental Abundances of Solar Sibling Candidates
• Stellar halo streams in the Solar neighbourhood
• Spatial Distribution and Kinematics of OB Stars
• Kinematic Analysis of Solar-Neighborhood Stars Based on RAVE4 Data
• Dependence of Kinematics on the Age of Stars in the Solar Neighborhood
• Classification of field dwarfs and giants in RAVE and its use in stellar stream detection
• Chemical compositions and kinematics of the Hercules stream
• Kinematically Detected Halo Streams
• Hercules and Wolf 630 Stellar Streams and Galactic Bar Kinematics
• Stellar substructures in the solar neighbourhood IV. Kinematic Group 1 in the Geneva-Copenhagen survey
• The nature of the KFR08 stellar stream
• On the origin of the Hercules group: I. chemical signatures indicating the outer bar origin
• Chemical abundances of field halo stars -- Implications for the building blocks of the Milky Way
• Determining the Galactic Bar Parameters based on the Hercules and Wolf 630 Stellar Streams
• Search for Stellar Streams Based on Data from the RAVE5 and Gaia TGAS Catalogues