Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have imaged the globular cluster NGC 7099 in the far-UV and visible with WFPC2 on the Hubble Space Telescope. Our far-UV images show a sparsely populated and fully resolved central region. The far-UV to visible color-magnitude diagram of these stars shows a well-defined horizontal branch with no evidence for hot, more evolved descendants. We find one hot horizontal branch star; the center of the cluster harbors four luminous blue stragglers. Far-UV images do not show any singularly steep density gradient at small radii among the horizontal branch stars of this post-core-collapse cluster.

Original languageEnglish (US)
Pages (from-to)762-766
Number of pages5
JournalAstrophysical Journal
Volume461
Issue number2 PART I
DOIs
StatePublished - Jan 1 1996
Externally publishedYes

Fingerprint

horizontal branch stars
globular clusters
cameras
hot stars
harbors
color-magnitude diagram
Hubble Space Telescope
harbor
diagram
stars
gradients
radii

Keywords

  • Globular clusters: individual (NGC 7099)
  • Stars: evolution
  • Stars: horizontal-branch
  • Ultraviolet: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Mould, J. R., Watson, A. M., Gallagher, J. S., Ballester, G. E., Burrows, C. J., Casertano, S., ... Westphal, J. A. (1996). Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera. Astrophysical Journal, 461(2 PART I), 762-766. https://doi.org/10.1086/177100

Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera. / Mould, Jeremy R.; Watson, Alan M.; Gallagher, John S.; Ballester, Gilda E.; Burrows, Christopher J.; Casertano, Stefano; Clarke, John T.; Crisp, David; Griffiths, Richard E.; Jeff Hester, J.; Hoessel, John G.; Holtzman, Jon A.; Scowen, Paul; Stapelfeldt, Karl R.; Trauger, John T.; Westphal, James A.

In: Astrophysical Journal, Vol. 461, No. 2 PART I, 01.01.1996, p. 762-766.

Research output: Contribution to journalArticle

Mould, JR, Watson, AM, Gallagher, JS, Ballester, GE, Burrows, CJ, Casertano, S, Clarke, JT, Crisp, D, Griffiths, RE, Jeff Hester, J, Hoessel, JG, Holtzman, JA, Scowen, P, Stapelfeldt, KR, Trauger, JT & Westphal, JA 1996, 'Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera', Astrophysical Journal, vol. 461, no. 2 PART I, pp. 762-766. https://doi.org/10.1086/177100
Mould JR, Watson AM, Gallagher JS, Ballester GE, Burrows CJ, Casertano S et al. Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera. Astrophysical Journal. 1996 Jan 1;461(2 PART I):762-766. https://doi.org/10.1086/177100
Mould, Jeremy R. ; Watson, Alan M. ; Gallagher, John S. ; Ballester, Gilda E. ; Burrows, Christopher J. ; Casertano, Stefano ; Clarke, John T. ; Crisp, David ; Griffiths, Richard E. ; Jeff Hester, J. ; Hoessel, John G. ; Holtzman, Jon A. ; Scowen, Paul ; Stapelfeldt, Karl R. ; Trauger, John T. ; Westphal, James A. / Far-ultraviolet imaging of the globular cluster ngc 7099 with the second wide-field and planetary camera. In: Astrophysical Journal. 1996 ; Vol. 461, No. 2 PART I. pp. 762-766.
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AU - Burrows, Christopher J.

AU - Casertano, Stefano

AU - Clarke, John T.

AU - Crisp, David

AU - Griffiths, Richard E.

AU - Jeff Hester, J.

AU - Hoessel, John G.

AU - Holtzman, Jon A.

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AU - Westphal, James A.

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AB - We have imaged the globular cluster NGC 7099 in the far-UV and visible with WFPC2 on the Hubble Space Telescope. Our far-UV images show a sparsely populated and fully resolved central region. The far-UV to visible color-magnitude diagram of these stars shows a well-defined horizontal branch with no evidence for hot, more evolved descendants. We find one hot horizontal branch star; the center of the cluster harbors four luminous blue stragglers. Far-UV images do not show any singularly steep density gradient at small radii among the horizontal branch stars of this post-core-collapse cluster.

KW - Globular clusters: individual (NGC 7099)

KW - Stars: evolution

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KW - Ultraviolet: stars

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