Journal article

Far-ultraviolet imaging of the large magellanic cloud populous cluster NGC 1978 with WFPC2

AA Cole, JR Mould, JS Gallagher, JT Clarke, JT Trauger, GE Ballester, CJ Burrows, S Casertano, D Crisp, R Griffiths, JJ Hester, JG Hoessel, JA Holtzman, PA Scowen, KR Stapelfeldt, JA Westphal

Astronomical Journal | Published : 1997


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,..

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University of Melbourne Researchers

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