期刊
ASTRONOMICAL JOURNAL
卷 125, 期 3, 页码 1291-1297出版社
IOP PUBLISHING LTD
DOI: 10.1086/367599
关键词
galaxies : dwarf; galaxies : individual (Fornax); galaxies : star clusters; Local Group
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] similar to 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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