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 178+/- 75. The specific frequency is estimated to be S_N=2.7+/- 1.1 adopting M_V = -19.55 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 [Fe/H] ~ -1 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.
Astronomy and Astrophysics
- Pub Date:
- June 1999
- GALAXIES: ELLIPTICAL AND LENTICULAR;
- GALAXIES: INDIVIDUAL: NGC 7457;
- GALAXIES: STAR CLUSTERS;
- 11 pages, including 4 tables and 7 figures. Accepted for publications in Astronomy and Astrophysics