SIMBAD references

2006A&A...451..909C - Astronomy and Astrophysics, volume 451, 909-916 (2006/6-1)

Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars.


Abstract (from CDS):

We study the kinematic structure of peripheral areas of the Ursa Majoris stream (Sirius supercluster). 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. 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.

Abstract Copyright:

Journal keyword(s): stars: formation - open clusters and associations: Ursa Major

CDS comments: Paragraph 6. HIP 36837 is a probable misprint for HIP 36827

Simbad objects: 136

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