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Title:
A Deep Proper-Motion Survey in Kapteyn Selected Areas. I. Survey Description and First Results for Stars in the Tidal Tail of Sagittarius and in the Monoceros Ring
Authors:
Casetti-Dinescu, Dana I.; Majewski, Steven R.; Girard, Terrence M.; Carlin, Jeffrey L.; van Altena, William F.; Patterson, Richard J.; Law, David R.
Affiliation:
AA(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 , , .; Astronomical Institute of the Romanian Academy, Strada Cutitul de Argint 5, RO-75212 Bucharest 28, Romania.), AB(Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 , , .), AC(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 , , .), AD(Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 , , .), AE(Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 , , .), AF(Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325 , , .), AG(Department of Astronomy, Mail Code 105-24, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125; .)
Publication:
The Astronomical Journal, Volume 132, Issue 5, pp. 2082-2098. (AJ Homepage)
Publication Date:
11/2006
Origin:
UCP
AJ Keywords:
Astrometry, Galaxy: Kinematics and Dynamics, Galaxy: Structure, Surveys
DOI:
10.1086/508274
Bibliographic Code:
2006AJ....132.2082C

Abstract

We describe a high-precision, deep (to V~19-21), absolute proper-motion survey that samples ~50 lines of sight in the Kapteyn selected areas along declination zones -15°, 0°, and 15°. In many fields the astrometric baseline reaches nearly a century. We demonstrate that these data provide typical per star precisions between ~1 and 3 mas yr-1 to the above magnitude limits, with the absolute reference frame established by numerous extragalactic sources in each survey field. Combined with existing and ongoing photometric and radial velocity surveys in these fields, these astrometric data will enable, among other things, accurate detailed dynamical modeling of satellite interactions with our Galaxy. In this contribution we describe the astrometric part of our survey and show preliminary results along the trailing tail of the Sagittarius dwarf galaxy, and in the Monoceros Ring region.
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