Identifying Compact Moving Groups Based on Stellar Kinematics Data

Details Identifying Compact Moving Groups Based on Stellar Kinematics Data Identifying Compact Moving Groups Based on Stellar Kinematics Data

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..169m&link_type=abstract

Astronomy Reports, vol. 47, Issue 3, p.169-175

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We investigate the possibility of identifying substructures in velocity space in three well-known stellar streams (the Hyades, the Pleiades, and Ursa Major) using a cluster-analysis method (the maximum-density method). Only compact groups in velocity space with radii no greater than 5 km/s and containing at least 10 members were considered. As an example, we analyzed a sample of 5377 stars from the HIPPARCOS catalog with known radial velocities located within 75 pc of the Sun. We identified a total of 24 groups of stars. Monte Carlo simulations show that most (about 80%) of these groups could be the results of Poisson noise and observational errors. Bona fide identification (at a significance level greater than 90%) of compact moving groups based on kinematic data requires higher accuracy of the stellar spatial velocities (with errors no greater than 1 2 km/s in each component).

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