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Ultraviolet Color-Magnitude Diagram Studies of Intermediate Age Large Magellanic Cloud Star Clusters.I.NGC 1783

Citation

Cole, AA and Gallagher, JS and Freedman, WL and Phelps, R, Ultraviolet Color-Magnitude Diagram Studies of Intermediate Age Large Magellanic Cloud Star Clusters.I.NGC 1783, Astronomical Journal, 113, (5) pp. 1700-1710. ISSN 0004-6256 (1997) [Refereed Article]

DOI: doi:10.1086/118386

Abstract

We have imaged the billion-year-old Large Magellanic Cloud star cluster NGC 1783 with the Wide Field/Planetary Camera 2 (WFPC2) in order to obtain broadband photometry at 1600 and 3300 Angstroms. We have identified for the first time the individual stars responsible for the unexpectedly strong ultraviolet light of intermediate-age stellar systems. The behavior of the hot component of aging stellar systems is not well known, and has important implications for the interpretation of light from high-redshift galaxies. Contrary to our expectations, there are far more hot stars present in this cool cluster than can be accounted for by the classical post-asymptotic giant branch. Of particular interest is a group of stars that is strongly concentrated in the core of the cluster. By constructing a relation between the WFPC2 UV colors and stellar effective temperatures, we have found that these stars do not lie in an area of the color-magnitude diagram that is crossed by any theoretical single-star stellar evolution tracks of the cluster's age. These data are insufficient to unambiguously identify the astrophysical nature of the anomalous UV-bright stars; we discuss possibilities for their origin.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Cole, AA (Dr Andrew Cole)
ID Code:71079
Year Published:1997
Web of Science® Times Cited:5
Deposited By:Physics
Deposited On:2011-07-07
Last Modified:2011-07-08
Downloads:0

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