A proper motion survey. I - Hyades and UMa moving groups

Details A proper motion survey. I - Hyades and UMa moving groups A proper motion survey. I - Hyades and UMa moving groups

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..904m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 904-910. Research supported by FONDECYT.

Other

8

Gravitational Fields, Star Clusters, Stellar Evolution, Stellar Motions, Celestial Mechanics, Early Stars, Red Giant Stars

Scientific paper

The results of a proper motion survey in a couple of ESO R 5 x 5 deg fields are analyzed, finding evidence for faint (and primarily red) members of the Hyades and UMa moving groups. By using the velocity ellipsoid of the Hyades and UMa streams and the technique described by Mendez and Ruiz (1992) number densities and nonbiased velocity dispersions for each moving group are estimated. The results suggest that the Hyades moving group extends at least 96 pc in the solid angle covered by this survey, while the UMa moving group shows a decrease in density past 36 pc. The large tangential velocity dispersion for both moving groups suggest on the other hand that they are not gravitationally bound.

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