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

Andrew A. Cole; Jeremy R. Mould; John S. Gallagher; John T. Clarke; John T. Trauger; Gilda E. Ballester; Christopher J. Burrows; Stefano Casertano; David Crisp; Richard Griffiths; J. Jeff Hester; John G. Hoessel; Jon A. Holtzman; Paul A. Scowen; Karl R. Stapelfeldt; James A. Westphal

doi:10.1086/118616

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

Andrew A. Cole, Jeremy R. Mould, John S. Gallagher, John T. Clarke, John T. Trauger, Gilda E. Ballester, Christopher J. Burrows, Stefano Casertano, David Crisp, Richard Griffiths, J. Jeff Hester, John G. Hoessel, Jon A. Holtzman, Paul A. Scowen, Karl R. Stapelfeldt, James A. Westphal

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 IUE.

Original language	English (US)
Pages (from-to)	1945-1950
Number of pages	6
Journal	Astronomical Journal
Volume	114
Issue number	5
DOIs	https://doi.org/10.1086/118616
State	Published - Nov 1997
Externally published	Yes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/118616

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Cole, A. A., Mould, J. R., Gallagher, J. S., Clarke, J. T., Trauger, J. T., Ballester, G. E., Burrows, C. J., Casertano, S., Crisp, D., Griffiths, R., Hester, J. J., Hoessel, J. G., Holtzman, J. A., Scowen, P. A., Stapelfeldt, K. R., & Westphal, J. A. (1997). Far-ultraviolet imaging of the large magellanic cloud populous cluster NGC 1978 with WFPC2. Astronomical Journal, 114(5), 1945-1950. https://doi.org/10.1086/118616

Cole, AA, 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 & Westphal, JA 1997, 'Far-ultraviolet imaging of the large magellanic cloud populous cluster NGC 1978 with WFPC2', Astronomical Journal, vol. 114, no. 5, pp. 1945-1950. https://doi.org/10.1086/118616

@article{3eb2e9cf4c8f4e5e9c66e659ca58c581,

title = "Far-ultraviolet imaging of the large magellanic cloud populous cluster NGC 1978 with WFPC2",

abstract = "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 IUE.",

author = "Cole, {Andrew A.} and Mould, {Jeremy R.} and Gallagher, {John S.} and Clarke, {John T.} and Trauger, {John T.} and Ballester, {Gilda E.} and Burrows, {Christopher J.} and Stefano Casertano and David Crisp and Richard Griffiths and Hester, {J. Jeff} and Hoessel, {John G.} and Holtzman, {Jon A.} and Scowen, {Paul A.} and Stapelfeldt, {Karl R.} and Westphal, {James A.}",

year = "1997",

month = nov,

doi = "10.1086/118616",

language = "English (US)",

volume = "114",

pages = "1945--1950",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

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T1 - Far-ultraviolet imaging of the large magellanic cloud populous cluster NGC 1978 with WFPC2

AU - Cole, Andrew A.

AU - Mould, Jeremy R.

AU - Gallagher, John S.

AU - Clarke, John T.

AU - Trauger, John T.

AU - Ballester, Gilda E.

AU - Burrows, Christopher J.

AU - Casertano, Stefano

AU - Crisp, David

AU - Griffiths, Richard

AU - Hester, J. Jeff

AU - Hoessel, John G.

AU - Holtzman, Jon A.

AU - Scowen, Paul A.

AU - Stapelfeldt, Karl R.

AU - Westphal, James A.

PY - 1997/11

Y1 - 1997/11

N2 - 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 IUE.

AB - 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 IUE.

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SP - 1945

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JO - Astronomical Journal

JF - Astronomical Journal

IS - 5

ER -

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

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