File(s) not publicly available
Far-Ultraviolet Imaging of the Large Magellanic Cloud Populous Cluster NGC 1978 with WFPC2
journal contribution
posted on 2023-05-17, 06:45 authored by Andrew ColeAndrew Cole, Mould, JR, Gallagher, JS, Clarke, JT, Trauger, JT, Ballester, GE, Burrows, CJ, Casertano, S, Crisp, D, Griffiths, R, Hester, JJ, Hoessel, JG, Holtzman, JA, Scowen, PA, Stapelfeldt, KR, Westphall, JAWe 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.
History
Publication title
Astronomical JournalVolume
114Issue
5Pagination
1945-1950ISSN
0004-6256Department/School
School of Natural SciencesPublisher
Univ Chicago PressPlace of publication
1427 E 60Th St, Chicago, USA, Il, 60637-2954Repository Status
- Restricted