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Communication Dans Un Congrès Année : 2011

The Search for Extremely Low-Metallicity Stars in Dwarf Galaxies Using the NIR Ca II Triplet

Résumé

The NIR Ca II triplet has proven to be an important tool for quantitative spectroscopy. Here we present results of synthetic spectral analysis for the Ca II triplet for low-metallicity red giant stars, combined with observational data. Our results start to deviate strongly from the widely-used and linear empirical calibrations below [Fe/H] = -2. We provide a new calibration for Ca II triplet studies which is valid down until [Fe/H] = -4 and apply this new calibration to current data sets. We suggest that the classical dwarf galaxies are not so devoid of extremely low-metallicity stars as was previously thought and discuss preliminary results and possibilities for follow-up observations of these extremely low-metallicity candidates.

Dates et versions

hal-03734413 , version 1 (21-07-2022)

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Citer

Else Starkenburg, Vanessa Hill, Eline Tolstoy, J. I. González Hernández, Michael J. Irwin, et al.. The Search for Extremely Low-Metallicity Stars in Dwarf Galaxies Using the NIR Ca II Triplet. CRAL-2010 A Universe of Dwarf Galaxies, Jun 2010, Lyon, France. pp.13-18, ⟨10.1051/eas/1148002⟩. ⟨hal-03734413⟩
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