Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vsgh.conf..173b&link_type=abstract
Variable Stars, the Galactic halo and Galaxy Formation, Proceedings of an international conference held in Zvenigorod, Russia, 1
Astronomy and Astrophysics
Astronomy
Scientific paper
Analysis of the velocities of ≈17000 individual stars in the Solar neighborhood was performed based on the new version of the Hipparcos catalogue and updated Geneva-Copenhagen survey of F- and G-dwarfs. The main known condensations, streams and branches (Pleiades, Hyades, Sirius, Coma Berenices, ζ Herculis, Wolf 630-α Ceti, Arcturus) were revealed using various methods. The evolution of the velocity field of F- and G-dwarfs was traced with respect to the ages of stars. We managed to prove the existence of the recently discovered stream KFR08. 19 Hipparcos stars - candidates to the membership in the stream KFR08 were found, and the isochronal estimate of the age of the stream - 13 billion years - was found using them. We demonstrate that the average ages of the streams Wolf 630-α Ceti and Hercules are comparable: 4-6 billion years. No essential differences in the metallicities of the stars of these streams were found. This is an argument in favor of the hypothesis that these streams have a common mechanism of origin.
Bajkova Anisa T.
Bobylev Vadim V.
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