A New Method for Identification of Moving Groups in the HIPPARCOS Database

Details A New Method for Identification of Moving Groups in the HIPPARCOS Database A New Method for Identification of Moving Groups in the HIPPARCOS Database

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8108a&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #81.08; Bulletin of the American Astronomical Society, Vol. 30, p.1154

Astronomy and Astrophysics

Astronomy

Scientific paper

A new method to identify moving groups in proper motion catalogues is introduced. It requires parallax and proper motion information. No radial velocity data is needed, thus it is well suited for the Hipparcos database. This method uses all the available information to constrain the locations of stars in velocity space, and then searches for statistically significative groupings of the constrained star locations. As the search is done in velocity space, groups need not be constrained in position on the sky to be identified. Monte Carlo experiments are used to gauge the success of this method for synthetic groups at various distances and kinematics. The method is then used on the Hyades; good agreement in the member list and a difference of only 0.3 km/s in center of mass velocity, is found with the work of work of Perryman et al. (1998), which included radial velocity information besides Hipparcos proper motions. Bibliography: Perryman, M.A., Brown, A.G., Lebreton, Y., Gomez, A., Turon, C., Cayrel de Strobel, G., Mermilliod, J., Robichon, N., Kovalevsky, J., Crifo, F. (1998), A.&A., submitted.

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