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1999AJ....117.1297D - Astron. J., 117, 1297-1312 (1999/March-0)
High angular resolution JHK imaging of the centers of the metal-poor globular clusters NGC 5272 (M3), NGC 6205 (M13), NGC 6287, and NGC 6341 (M92).
DAVIDGE T.J. and COURTEAU S.
Abstract (from CDS):
The clusters are paired according to metallicity, and the near-infrared CMDs and luminosity functions are used to investigate the relative ages within each pair. The near-infrared CMDs provide the tightest constraints on the relative ages of the classical second-parameter pair NGC 5272 and NGC 6205 and indicate that these clusters have ages that differ by no more than ±1 Gyr. These results thus support the notion that age is not the second parameter. We tentatively conclude that NGC 6287 and NGC 6341 have ages that differ by no more than ±2 Gyr. However, the near-infrared spectral energy distributions of stars in NGC 6287 appear to differ from those of stars in outer halo clusters, bringing into question the validity of this age estimate.
Abstract Copyright: ∼
Journal keyword(s): globular clusters: individual (NGC 5272, NGC 6205, NGC 6287, NGC 6341) - Infrared: Stars
Simbad objects: 7
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