Spectroscopy of Globular Clusters in the Fornax dwarf galaxy

Details Spectroscopy of Globular Clusters in the Fornax dwarf galaxy Spectroscopy of Globular Clusters in the Fornax dwarf galaxy

2002-11-30

arxiv.org/abs/astro-ph/0212001v1

Astronomy and Astrophysics

Astrophysics

21 pages, including 3 figures. To appear in AJ, March 2003

Scientific paper

10.1086/367599

We present low resolution, integrated Keck spectra of the five globular clusters (GCs) of the Fornax dwarf spheroidal galaxy. We find a tentative age spread among the clusters, with the GC H5 younger by 2-3 Gyr than the others. The clusters generally appear to be very metal-poor ([Fe/H] ~ -1.8), with the cluster H4 slightly more metal-rich at [Fe/H] = -1.5. We speculate that cluster H4 is similar to the Galactic GC Ruprecht 106, which lacks the [alpha/Fe] enhancement typical among metal-poor GCs in the Milky Way. High-resolution spectroscopy of individual cluster and field stars will be needed to sort out the surprisingly complex history of GC formation and evolution in this galaxy.

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