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Age Dating of Globular Clusters Using UBV(RI) Main-sequence Photometry in the Two-color Diagram: Age of NGC 6397

Published online by Cambridge University Press:  03 August 2017

Valery V. Kravtsov
Valery V. Kravtsov*
Affiliation:
Sternberg Astron. Ins., 13, University Ave., Moscow 119899, Russia

Abstract

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I propose and apply a method for deriving ages of the metal-poor globular clusters (GCs) in a distance-independent way, which is based on an age indicator related to the main sequence in the two-color diagrams using the U-B index. The age of the metal-poor GC NGC 6397 has been estimated, using Yale isochrones of Demarque et al. (1996), to be close to 16 Gyr provided the cluster metallicity is near [Fe/H] = −2.0.

Type
Part 4. Star Cluster Formation and Evolution: Theory and Observation
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 719 - 720
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Alcaino, G., Liller, W., Alvarado, F., et al. 1997, AJ, 114, 1067 Google Scholar
Castilho, B. V., Pasquini, L., Allen, D. M., et al. 2000, A&A, 361, 92 Google Scholar
Demarque, P., Chaboyer, B., Guenther, D., et al. 1996, Yale Isochrones Google Scholar
Gratton, R. G., Bonifacio, P., Bragaglia, A., et al. 2000, astro-ph/0012457 Google Scholar
Grundahl, F., VandenBerg, D. A., Bell, R. A, et al. 2000, AJ, 120, 1884 Google Scholar