Analysis and calibration of Ca ii triplet spectroscopy of red giant branch stars from VLT/FLAMES observations
Identifieur interne : 000163 ( Main/Exploration ); précédent : 000162; suivant : 000164Analysis and calibration of Ca ii triplet spectroscopy of red giant branch stars from VLT/FLAMES observations
Auteurs : G. Battaglia [Pays-Bas] ; M. Irwin ; E. Tolstoy [Pays-Bas] ; V. Hill [France] ; A. Helmi [Pays-Bas] ; B. Letarte [Pays-Bas, États-Unis] ; P. Jablonka [Suisse]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2008-01-01.
Abstract
We demonstrate that low-resolution Ca ii triplet (CaT) spectroscopic estimates of the overall metallicity ([Fe/H]) of individual red giant branch (RGB) stars in two nearby dwarf spheroidal galaxies (dSphs) agree to ±0.1–0.2 dex with detailed high-resolution spectroscopic determinations for the same stars over the range −2.5 < [Fe/H] < −0.5. For this study, we used a sample of 129 stars observed in low- and high-resolution modes with VLT/FLAMES in the Sculptor and Fornax dSphs. We also present the data-reduction steps we used in our low-resolution analysis and show that the typical accuracy of our velocity and CaT [Fe/H] measurement is ∼2 km s−1 and 0.1 dex, respectively. We conclude that CaT–[Fe/H] relations calibrated on globular clusters can be applied with confidence to RGB stars in composite stellar populations over the range −2.5 < [Fe/H] < −0.5.
Url:
DOI: 10.1111/j.1365-2966.2007.12532.x
Affiliations:
- France, Pays-Bas, Suisse, États-Unis
- Groningue (province), Île-de-France
- Groningue (ville), Meudon
- Université de Groningue
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