SIMBAD references

2016MNRAS.455..199D - Mon. Not. R. Astron. Soc., 455, 199-206 (2016/January-1)

The CaII triplet in red giant spectra: [Fe/H] determinations and the role of [Ca/Fe].

DA COSTA G.S.

Abstract (from CDS):

Measurements are presented and analysed of the strength of the CaII triplet lines in red giants in Galactic globular and open clusters, and in a sample of red giants in the LMC disc that have significantly different [Ca/Fe] abundance ratios to the Galactic objects. The Galactic objects are used to generate a calibration between CaII triplet line strength and [Fe/H], which is then used to estimate [Fe/H]CaT for the LMC stars. The values are then compared with the [Fe/H]spec determinations from high-dispersion spectroscopy. After allowance for a small systematic offset, the two abundance determinations are in excellent agreement. Further, as found in earlier studies, the difference is only a very weak function of the [Ca/Fe] ratio. For example, changing [Ca/Fe] from +0.3 to -0.2 causes the CaII-based abundance to underestimate [Fe/H]spec by only ∼ 0.15 dex, assuming a Galactic calibration. Consequently, the CaII triplet approach to metallicity determinations can be used without significant bias to study stellar systems that have substantially different chemical evolution histories.

Abstract Copyright: © 2015 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): techniques: spectroscopic - stars: abundances - stars: Population II - globular clusters: general - Magellanic Clouds

VizieR on-line data: <Available at CDS (J/MNRAS/455/199): clusters.dat table3.dat>

Simbad objects: 182

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