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2 results

  • The Globular Cluster Terzan 7 in the Sagittarius Dwarf Spheroidal Galaxy

  • Enrico V. Held, Alfred Rosenberg, Ivo Saviane, Yazan Momany
  • Journal:
    Symposium - International Astronomical Union / Volume 207 / 2002
    Published online by Cambridge University Press:
    03 August 2017, pp. 165-167
    Print publication:
    2002
    • Article
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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.