Hubble Space Telescope Observations of the Oldest Star Clusters in the LMC

Details Hubble Space Telescope Observations of the Oldest Star Clusters in the LMC Hubble Space Telescope Observations of the Oldest Star Clusters in the LMC

1999-11-10

arxiv.org/abs/astro-ph/9911187v1

Astronomy and Astrophysics

Astrophysics

22 pages; to be published in ApJ

Scientific paper

10.1086/308066

We present V, V-I color-magnitude diagrams (CMDs) for three old star clusters in the Large Magellanic Cloud (LMC): NGC 1466, NGC 2257 and Hodge 11. Our data extend about 3 magnitudes below the main-sequence turnoff, allowing us to determine accurate relative ages and the blue straggler frequencies. Based on a differential comparison of the CMDs, any age difference between the three LMC clusters is less than 1.5 Gyr. Comparing their CMDs to those of M 92 and M 3, the LMC clusters, unless their published metallicities are significantly in error, are the same age as the old Galactic globulars. The similar ages to Galactic globulars are shown to be consistent with hierarchial clustering models of galaxy formation. The blue straggler frequencies are also similar to those of Galactic globular clusters. We derive a true distance modulus to the LMC of (m-M)=18.46 +/- 0.09 (assuming (m-M)=14.61 for M 92) using these three LMC clusters.

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