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Title:
Hubble Space Telescope Observations of the Oldest Star Clusters in the Large Magellanic Cloud
Authors:
Johnson, Jennifer A.; Bolte, Michael; Stetson, Peter B.; Hesser, James E.; Somerville, Rachel S.
Affiliation:
AA(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 , ), AB(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 , ), AC(Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC, V8X 4M6, Canada; ), AD(Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC, V8X 4M6, Canada; ), AE(Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel; )
Publication:
The Astrophysical Journal, Volume 527, Issue 1, pp. 199-218. (ApJ Homepage)
Publication Date:
12/1999
Origin:
UCP
ApJ Keywords:
STARS: BLUE STRAGGLERS, GLOBULAR CLUSTERS: INDIVIDUAL (NGC 1466), GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL: NGC NUMBER: NGC 2257, GLOBULAR CLUSTERS: INDIVIDUAL (HODGE 11), GALAXIES: MAGELLANIC CLOUDS
DOI:
10.1086/308066
Bibliographic Code:
1999ApJ...527..199J

Abstract

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 ~3 mag 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 M92 and M3, 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)0=18.46+/-0.09 [assuming (m-M)0=14.61 for M92] using these three LMC clusters.
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