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A New Survey of Globular Cluster Structural and Luminosity Parameters

Published online by Cambridge University Press:  19 July 2016

B. Cameron Reed  and
Charles J. Peterson
B. Cameron Reed
Affiliation:
St. Mary's University, Halifax
Charles J. Peterson
Affiliation:
University of Missouri

Extract

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We have made an analysis of the visual photometric data contained in the Catalogue of Concentric Aperture UBVRI Photoelectric Photometry of Globular Clusters (Peterson 1986). Structural parameters have been obtained by use of the Simplex algorithm of Caceci and Cacheris (1984) to fit the model curves of King (1966) to the run of cluster luminosity with radius. We find that concentric aperture photometry alone can be used to determine globular cluster core radii and central surface brigtnesses reliably. Application of this techique, however, is limited to about two-thirds of the known clusters of the Galaxy because no or inadequate numbers of photometric measurements exist for the remaining clusters. Accurate determination of cluster concentration classes still requires use of other types of data, such as star counts.

Type
Chapter VII. Poster Papers on Harlow Shapley and Globular Clusters in the Milky Way
Information
Symposium - International Astronomical Union , Volume 126: The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies , 1988 , pp. 489 - 490
Copyright
Copyright © Kluwer 1988 

References

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