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Absolute Proper Motion of Galactic Globular Clusters

Published online by Cambridge University Press:  07 August 2017

R.-D. Scholz  and
M. J. Irwin
R.-D. Scholz
Affiliation:
WIP Projektgruppe Astrometrie bei der Universität Potsdam An der Sternwarte, 16 O-1590 Potsdam Germany
M. J. Irwin
Affiliation:
WIP Projektgruppe Astrometrie bei der Universität Potsdam An der Sternwarte, 16 O-1590 Potsdam Germany

Abstract

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Using automated scans of Tautenburg Schmidt plates with the APM facility in Cambridge (UK) the mean tangential motion of two globular clusters, M3 and M92, is determined directly with respect to a well defined extragalactic reference frame. In both fields five pairs of plates centred on the cluster with epoch differences from 20 to 27 years were measured. In the independent proper motion determination with 1200 to 2300 reference galaxies for each pair of plates we used 3rd order polynomials and a stepwise regression method. The mean absolute cluster p.m. corrected for systematic effects dependent on the coordinates was obtained with an accuracy of ±0.03 arcsec/century for M3 and ±0.06 arcsec/century for M92.

Type
Impact on Astrophysics
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 249 - 254
Copyright
Copyright © Kluwer 

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