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

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

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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.

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.

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