Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1700c&link_type=abstract
Astronomical Journal v.113, p. 1700-1710 (1997)
Astronomy and Astrophysics
Astrophysics
5
Scientific paper
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.
Cole Andrew A.
Freedman Wendy L.
Gallagher John S. III
Phelps Randy
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