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HST Observations of 3 More Old LMC Clusters

Published online by Cambridge University Press:  03 August 2017

Jennifer A. Johnson ,
Michael Bolte ,
Peter B. Stetson  and
James E. Hesser
Jennifer A. Johnson
Affiliation:
OCIW, 813 Santa Barbara St., Pasadena, CA 91101, USA
Michael Bolte
Affiliation:
UCO/Lick Observatory, UCSC, Santa Cruz, CA 95064, USA
Peter B. Stetson
Affiliation:
DAO/HIA/NRC, 5071 West Saanich Rd., Victoria, BC, V8X 4M6, Canada
James E. Hesser
Affiliation:
DAO/HIA/NRC, 5071 West Saanich Rd., Victoria, BC, V8X 4M6, Canada

Abstract

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We present color-magnitude diagrams (CMDs) based on HST F555W (“V”) and F814W (“I”) observations of three old LMC clusters: NGC 2210, NGC 1786, and Reticulum. The fiducial derived from the CMD of NGC 2257, another LMC cluster, provided a good fit to the data for the new clusters. Because NGC 2257 has a similar metallicity ([Fe/H]∼ −1.8) to NGC 2210, NGC 1786, and Reticulum, the agreement between the CMDs of all four clusters indicates that they have the same age. This preliminary analysis suggests that any age differences are smaller than 2 Gyr. These new results mean that there are now 11 old LMC clusters with similar ages. An initial epoch of star cluster formation therefore happened in a short period over a large volume of space, a volume much larger than is now covered by the present-day optical LMC.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 190 - 192
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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