Volume 451, Number 3, June I 2006
|Page(s)||909 - 916|
|Section||Galactic structure, stellar clusters, and populations|
|Published online||04 May 2006|
Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars
Institute of Astronomy of the Russian Academy of Sciences, 48 Pyatnitskaya Str., 119017 Moscow, Russia e-mail: email@example.com
Accepted: 5 January 2006
Aims.We study the kinematic structure of peripheral areas of the Ursa Majoris stream (Sirius supercluster).
Methods.We use diagrams of individual stellar apexes developed by us and the classical technique of proper motion diagrams generalized to a star sample distributed over the sky.
Results.Out of 128 cluster members we have identified three corona (sub)structures comprised of 13, 13 and 8 stars. The substructures have a spatial extension comparable to the size of the corona. Kinematically, these groups are distinguished by their proper motions, radial velocities and by the directions of their spatial motion. Coordinates of their apexes significantly differ from those of the apexes of the stream and its nucleus. Our analysis shows that these substructures do not belong to known kinematic groups, such as Hyades or Castor. We find kinematic inhomogeneity of the corona of the UMa stream.
Key words: stars: formation / open clusters and associations: Ursa Major
© ESO, 2006
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.