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Far-Ultraviolet Imaging of the Large Magellanic Cloud Populous Cluster NGC 1978 with WFPC2


Cole, AA and Mould, JR and Gallagher, JS and Clarke, JT and Trauger, JT and Ballester, GE and Burrows, CJ and Casertano, S and Crisp, D and Griffiths, R and Hester, JJ and Hoessel, JG and Holtzman, JA and Scowen, PA and Stapelfeldt, KR and Westphall, JA, Far-Ultraviolet Imaging of the Large Magellanic Cloud Populous Cluster NGC 1978 with WFPC2, Astronomical Journal, 114, (5) pp. 1945-1950. ISSN 0004-6256 (1997) [Refereed Article]

DOI: doi:10.1086/118616


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.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Associate Professor Andrew Cole)
ID Code:71070
Year Published:1997
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2011-07-07
Last Modified:2011-07-08

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