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An Automated HR Diagram for NGC 6809 (M 55)

Published online by Cambridge University Press:  19 July 2016

Michael J. Irwin  and
Virginia Trimble
Michael J. Irwin
Affiliation:
Institute of Astronomy, Cambridge
Virginia Trimble
Affiliation:
University of Maryland and University of California

Abstract

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For decades, star counts and HR diagrams extending below the main sequence turnoff in globular clusters meant the work of Sandage (1957). The advent of large CCD's at the foci of large telescopes has changed this (McClure et al. 1985, Harris & Hesser 1985, Christian & Heasley 1986, Heasley et al. 1986, Penny & Dickens 1986, Richer & Fahlman 1986, Smith et al. 1986) and made clear that clusters differ in the shapes of their luminosity functions and in the morphology of their HR diagrams. We return here to photographic methods, which can capture an order of magnitude more images and so possibly reveal new details.

Type
Chapter IX. Poster Papers on Cluster Systems in Distant Galaxies. Deep Photometry and CM Diagrams
Information
Symposium - International Astronomical Union , Volume 126: The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies , 1988 , pp. 627 - 628
Copyright
Copyright © Kluwer 1988 

References

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