Age and metallicity of a globular cluster in the dwarf spheroidal galaxy DDO78

Details Age and metallicity of a globular cluster in the dwarf spheroidal galaxy DDO78 Age and metallicity of a globular cluster in the dwarf spheroidal galaxy DDO78

2002-08-23

arxiv.org/abs/astro-ph/0208428v1

Astron.Astrophys. 397 (2003) 831-838

Astronomy and Astrophysics

Astrophysics

20 pages, 5 figures; Astronomy and Astrophysics, in preparation

Scientific paper

10.1051/0004-6361:20021342

We present the results of moderate resolution spectroscopy for a globular cluster in the M81 group dwarf spheroidal galaxy DDO~78. The DDO78 globular cluster, 4 Milky Way globular clusters, spectroscopic and radial velocity standards were observed with the Long-slit spectrograph of the 6-m telescope (SAO RAS, Russia). Lick spectrophotometric indices were determined in the bandpasses adopted by Burstein et al. (1984). We have derived the mean metallicity of the globular cluster in DDO78 to be [Fe/H] = -1.6 +- 0.1 dex by taking the weighted mean of metallicities obtained from the strength of several absorption features. We have estimated an age for the globular cluster of 9-12 Gyr similar to that found for the Galactic globular cluster NGC362, which resembles our cluster by chemical abundance and integrated spectrophotometric properties.

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