Far-Ultraviolet Imaging of the Globular Cluster NGC 7099 with the Second Wide-Field and Planetary Camera
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 -collapse cluster.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1996
- DOI:
- 10.1086/177100
- Bibcode:
- 1996ApJ...461..762M
- Keywords:
-
- STARS: EVOLUTION;
- GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL NGC NUMBER: NGC 7099;
- STARS: HORIZONTAL-BRANCH;
- ULTRAVIOLET: STARS