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Astron. Astrophys. 346, 721-730 (1999)

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The globular cluster system around the low-luminosity S0 galaxy NGC 7457

S. Chapelon 1, V. Buat 1,2, D. Burgarella 1 and M. Kissler-Patig *  3

1 IGRAP, Laboratoire d'Astronomie Spatiale du CNRS, B.P. 8, F-13376 Marseille Cedex 12, France
2 Laboratoire des interactions photons-matière, Faculté des Sciences de Saint Jérôme, F-13397 Marseille Cedex 20, France
3 European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching, Germany

Received 22 December 1998 / Accepted 1 April 1999

Abstract

We investigate the globular cluster system around the low-luminosity S0 galaxy NGC 7457 with deep B, V, I photometry. From the V photometry the total number of globular clusters around the galaxy is estimated to be [FORMULA]. The specific frequency is estimated to be [FORMULA] adopting [FORMULA] mag for the galaxy.

We select 89 globular cluster candidates on the basis of their colors (B-I, V-I and B-V). The B-I and V-I color distributions are found unimodal with a mean metallicity [FORMULA] dex. Nevertheless the width of the B-I color distribution is found larger than that expected for a single population of globular clusters and is consistent with the presence of more than one population. If the latter is the case, the two peaks would not be detected in B-I because of the small statistics and/or a small difference in the mean metallicity of the two populations. No metal poor globular clusters similar to those of the Milky Way halo are detected around NGC 7457.

Key words: galaxies: elliptical and lenticular, cD – galaxies: individual: NGC 7457 – galaxies: star clusters

* Feodor Lynen Fellow of the Alexander von Humboldt Foundation

Send offprint requests to: V. Buat

Correspondence to: buat@astrsp-mrs.fr

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© European Southern Observatory (ESO) 1999

Online publication: June 17, 1999
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