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B and V photometry of the metal-rich bulge globular cluster NGC 6304 *
S. Ortolani 1,
Y. Momany 1,
E. Bica 2 and
B. Barbuy 3
Received 20 January 2000 / Accepted 9 March 2000
We present B and V photometry of the bulge globular cluster NGC 6304. We derive a reddening E(B-V) 0.5 and a distance from the Sun 6 kpc. From the red giant branch morphology we estimate that the metallicity of NGC 6304 is intermediate between those of 47 Tuc and NGC 6528.
The cluster is foreground to the bulk of the bulge population and the reddenings are comparable.
Evidence of a hot stellar component belonging to the cluster is found. These hot stars could correspond to a blue extended horizontal branch and/or blue stragglers.
Key words: stars: Hertzsprung Russel (HR) and C-M diagrams Galaxy: globular clusters: individual: NGC 6304
Send offprint requests to: B. Barbuy
Online publication: June 5, 2000