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

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Evolution, Galaxy: Globular Clusters: Individual Ngc Number: Ngc 7099, Stars: Horizontal-Branch, Ultraviolet: Stars

Scientific paper

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.

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