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Far-Ultraviolet Imaging of the Globular Cluster NGC 7099 with the Second Wide-Field and Planetary Camera

Mould, Jeremy R. and Watson, Alan M. and Gallagher, John S., III and Ballester, Gilda E. and Burrows, Christopher J. and Casertano, Stefano and Clarke, John T. and Crisp, David and Griffiths, Richard E. and Hester, J. Jeff and Hoessel, John G. and Holtzman, Jon A. and Scowen, Paul A. and Stapelfeldt, Karl R. and Trauger, John T. and Westphal, James A. (1996) Far-Ultraviolet Imaging of the Globular Cluster NGC 7099 with the Second Wide-Field and Planetary Camera. Astrophysical Journal, 461 (2). pp. 762-766. ISSN 0004-637X. doi:10.1086/177100.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mould, Jeremy R.0000-0003-3820-1740
Gallagher, John S., III0000-0001-8608-0408
Crisp, David0000-0002-4573-9998
Stapelfeldt, Karl R.0000-0002-2805-7338
Additional Information:© 1996 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1995 August 28; accepted 1995 October 4. Based on observations with the NASA/ESA Hubble Space Telescope. We are grateful to Brian Yanny and Don Schneider for contributing their optical CMD, and to Ben Dorman for providing HB models. J. R. M. thanks Gary Da Costa for a critical reading of the manuscript. This research was carried out by the WFPC2 Investigation Definition Team for JPL and was sponsored by NASA through contract NAS 7-1260. The WFPC2 IDT acknowledges the hospitality of Lowell Observatory.
Funding AgencyGrant Number
NASANAS 7-1260
Subject Keywords:globular clusters: individual (NGC 7099), stars: evolution, stars: horizontal-branch, ultraviolet: stars
Issue or Number:2
Record Number:CaltechAUTHORS:20150114-133708737
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Official Citation:Far-Ultraviolet Imaging of the Globular Cluster NGC 7099 with the Second Wide-Field and Planetary Camera Mould, J. R., Watson, A. M., Gallagher, J. S., III, Ballester, G. E., Burrows, C. J., Casertano, S., Astrophysical Journal v.461, p.762-766
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53725
Deposited By: Ruth Sustaita
Deposited On:14 Jan 2015 23:12
Last Modified:10 Nov 2021 20:06

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