Age and metallicity of a globular cluster in the dwarf spheroidal galaxy DDO78
arXiv:astro-ph/0208428 · doi:10.1051/0004-6361:20021342
Abstract
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.
20 pages, 5 figures; Astronomy and Astrophysics, in preparation
References in corpus (7)
- Population Gradients in Local Group Dwarf Spheroidals
- A blind HI survey of the M81 group
- Age as the Second Parameter in NGC 288 / NGC 362? I. Turnoff Ages: a Purely Differential Comparison
- Age as the Second Parameter in NGC 288/NGC 362? II. The Horizontal Branch Revisited
- Spectroscopy of Globular Clusters in M81
- Globular cluster systems II: On the formation of old globular clusters and their sites of formation
- Radial Velocities of Dwarf Spheroidal Galaxies in the M81 Group
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- Observations of Lick Standard Stars Using the SCORPIO Multi-Slit Unit at the SAO 6-m Telescope