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20 April 2024

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Age Dating of Globular Clusters Using UBV(RI) Main-sequence Photometry in the Two-color Diagram: Age of NGC 6397
Valery V. Kravtsov ;
Date:	26 Jun 2001
Subject:	astro-ph
Affiliation:	Sternberg Astronomical Institute
Abstract:	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 age indicator related to the main sequence in the two-color diagrams with U-B index. 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.
Source:	arXiv, astro-ph/0106461
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