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Astron. Astrophys. 357, 495-500 (2000)


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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

1 Università di Padova, Dipartimento di Astronomia, Vicolo dell'Osservatorio 5, 35122 Padova, Italy (ortolani, momany@pd.astro.it)
2 Universidade Federal do Rio Grande do Sul, Dept. de Astronomia, CP 15051, Porto Alegre 91501-970, Brazil (bica@if.ufrgs.br)
3 Universidade de São Paulo, Dept. de Astronomia, CP 3386, São Paulo 01060-970, Brazil (barbuy@orion.iagusp.usp.br)

Received 20 January 2000 / Accepted 9 March 2000

Abstract

We present B and V photometry of the bulge globular cluster NGC 6304. We derive a reddening E(B-V) [FORMULA] 0.5 and a distance from the Sun [FORMULA] [FORMULA] 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

* Observations collected at the European Southern Observatory - ESO, Chile, proposal no. 61.E-0335

Send offprint requests to: B. Barbuy

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000

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