Spectroscopy of globular clusters in the Fornax dwarf galaxy

被引：56

作者：

Strader, J ^{[1
]}

Brodie, JP

Forbes, DA

Beasley, MA

Huchra, JP

机构：

[1] Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA

[2] Swinburne Univ, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

来源：

ASTRONOMICAL JOURNAL | 2003年 / 125卷 / 03期

关键词：

galaxies : dwarf; galaxies : individual (Fornax); galaxies : star clusters; Local Group;

D O I：

10.1086/367599

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：1291 / 1297

页数：7

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