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Kinematics of OB Associations and the First Data from the Gaia Satellite

Dambis, A. K.; Mel'nik, A. M.

The first data release from the Gaia mission (Gaia DR1) is used to study kinematics of OB associations. The mean velocity dispersion in 18 OB associations containing at least 10 stars with proper motions from the TGAS catalog is 3.9 km/s. The contribution of binary systems to the velocity dispersions in OB associations is, on average, 1.2 km/s. Ex…

"Carte du Ciel" Catalogs and Their Importance for Modern Astrometry

Sementsov, V. N.

Astronomical catalogs created as a result of the "Carte du Ciel" project are considered, including the work of K.V. Kuimov in this area, its methodological importance, and perspectives in the GAIA era. This paper is based on a presentation made at the conference "Modern Astrometry 2017," dedicated to the memory of K.V. Kuimov (Sternberg Astronomic…

Kinematic Groups in the Corona of the Ursa Majoris Flow Indicated by Gaia Data

Vereshchagin, S. V.; Chupina, N. V.; Postnikova, E. S.

The internal kinematics of the Ursa Majoris stellar flow is considered. The details of the flow structure are considered, and new candidate members are searched for using high-precision Gaia DR1 TGAS data. The flow structure is studied using apex diagrams, which have been shown to be effective in studies of open clusters. To select member-stars of…