Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.1945c&link_type=abstract
Astronomical Journal v.114, p.1945
Astronomy and Astrophysics
Astronomy
6
Ultraviolet: Galaxies, Magellanic Clouds, Galaxies: Star Clusters
Scientific paper
We have imaged the ˜2.2 billion-year-old Large Magellanic Cloud populous cluster NGC 1978 in the far-ultraviolet and visible with the second Wide Field/Planetary Camera (WFPC2) on the Hubble Space Telescope. The far-ultraviolet images show a sparse stellar field with little apparent density enhancement in the cluster core. The visible images are dominated by the cluster' s first-ascent and second-ascent red giants, which are completely invisible to the far-ultraviolet filter. No evidence for a hot horizontal branch population of core-helium-burning stars is seen; nor is there any apparent indication of a significant blue straggler population. These results suggest that the presence of a rich, young population of field stars in the NGC 1978 region is responsible for the unusual location of the cluster in the integrated light color-color plots produced by lUE.
Ballester Gilda E.
Burrows Christopher J.
Casertano Stefano
Clarke John T.
Cole Andrew A.
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