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Title:
Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample
Authors:
Casetti-Dinescu, Dana I.; Girard, Terrence M.; Herrera, David; van Altena, William F.; López, Carlos E.; Castillo, Danilo J.
Affiliation:
AA(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA; , , , .; Astronomical Institute of the Romanian Academy, Str. Cutitul de Argint 5, RO-75212 Bucharest 28, Romania.), AB(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA; , , , .), AC(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA; , , , .), AD(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA; , , , .), AE(Yale Southern Observatory, Universidad Nacional de San Juan, Avenida Benavídez 8175 Oeste, 5407 Marquesado, San Juan, Argentina; .), AF(Yale Southern Observatory, Barreal, Calingasta, Argentina; .)
Publication:
The Astronomical Journal, Volume 134, Issue 1, pp. 195-204. (AJ Homepage)
Publication Date:
07/2007
Origin:
UCP
AJ Keywords:
Astrometry, Galaxy: Globular Clusters: Individual: NGC Number: NGC 2808, Galaxy: Globular Clusters: Individual: NGC Number: NGC 3201, globular clusters: individual (NGC 4372), Galaxy: Globular Clusters: Individual: NGC Number: NGC 4833, Galaxy: Globular Clusters: Individual: NGC Number: NGC 5927, Galaxy: Globular Clusters: Individual: NGC Number: NGC 5986, Surveys
DOI:
10.1086/518507
Bibliographic Code:
2007AJ....134..195C

Abstract

We have measured the absolute proper motions of globular clusters NGC 2808, 3201, 4372, 4833, 5927, and 5986. The proper motions are on the Hipparcos system, and they are the first determinations ever made for these low Galactic latitude clusters. The proper-motion uncertainties range from 0.3 to 0.5 mas yr-1. The inferred orbits indicate that (1) the single metal-rich cluster in our sample, NGC 5927, dynamically belongs to the thick disk; (2) the remaining metal-poor clusters have rather low-energy orbits of high eccentricity, and among these there appear to be two ``pairs'' of dynamically associated clusters; (3) the most energetic cluster in our sample, NGC 3201, is on a highly retrograde orbit-which had already been surmised from radial velocity alone-with an apocentric distance of 22 kpc; and (4) none of the metal-poor clusters appear to be associated with the recently detected SDSS streams or with the Monoceros structure. These are the first results of the Southern Proper Motion program where the second-epoch observations are taken with the recent CCD camera system installed on the double astrograph at El Leoncito, Argentina.

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