Age Distribution of Galactic Globular Clusters using HST Snapshot Photometry

Details Age Distribution of Galactic Globular Clusters using HST Snapshot Photometry Age Distribution of Galactic Globular Clusters using HST Snapshot Photometry

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2607l&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #26.07; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present relative ages for a sample of Galactic globular clusters (GCs) using their color-magnitude diagrams (CMDs) observed with the HST/WFPC2 camera in the F439W and F555W bands. The ages are obtained by differential comparison of the CMDs of GCs using Δ(B-V) method, the color difference between main-sequence turnoff and the lower red-giant branch. All metal-poor GCs with [Fe/H] < -1.7 show old ( 12 Gyr) ages and are coeval. Intermediate-metallicity clusters (-1.7 < [Fe/H] < -0.8) are on average 2 Gyr younger than the most metal-poor counterparts, with a large age dispersion and a total age range of 2 Gyr. We also discuss the correlation of relative ages with the horizontal-branch morphologies of GCs.

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