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The Globular Cluster Terzan 7 in the Sagittarius Dwarf Spheroidal Galaxy

Published online by Cambridge University Press:  03 August 2017

Enrico V. Held
Osservatorio Astronomico di Padova, I-35122 Padova, Italy
Alfred Rosenberg
Instituto de Astrofísica de Canarias, 38200 La Laguna, Spain
Ivo Saviane
European Southern Observatory, Casilla 19001, Santiago 19, Chile
Yazan Momany
Dipartimento di Astronomia, Univ. di Padova, I-35122 Padova, Italy


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We present deep V, I photometry of the globular cluster Terzan 7, a probable member of the globular cluster system of the Sagittarius dwarf spheroidal galaxy. The metallicity, estimated from a new method based on analytic RGB fits, agrees with previous estimates based on color-magnitude diagrams ([Fe/H]= −0.9 ± 0.1 dex). This result confirms a discrepancy between photometric and spectroscopic determinations. Using both the horizontal and vertical methods to estimate relative ages, we confirm that the age of Terzan 7 is about 70% that of 47 Tuc. A rich population of blue stragglers is found, strongly concentrated toward the center of the cluster.

Part 1. The Star Clusters of Local Group Galaxies
Copyright © Astronomical Society of the Pacific 2002 


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