Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-03-27
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication in MNRAS. The paper contains 19 figures and 10 tables. Table 10 is for online publication only. Relat
Scientific paper
Using the near-infrared spectral stellar library of Cenarro et al. (2001a,b), the behaviours of the Mg I line at 8807 angstrom and nearby TiO bands are analyzed in terms of the effective temperature, surface gravity, and metallicity of the library stars. New spectroscopic indices for both spectral features -namely MgI and sTiO- are defined, and their sensitivities to different signal-to-noise ratios, spectral resolutions, flux calibrations, and sky emission line residuals are characterized. The new two indices exhibit interesting properties. In particular, MgI reveals as a good indicator of the Mg abundance, whereas sTiO is a powerful dwarf-to-giant discriminator for cold spectral types. Empirical fitting polynomials that reproduce the strength of the new indices as a function of the stellar atmospheric parameters are computed, and a FORTRAN routine with the fitting functions predictions is made available. A thorough study of several error sources, non-solar [Mg/Fe] ratios, and their influence on the fitting function residuals is also presented. From this analysis, a [Mg/Fe] underabundance of ~ -0.04 is derived for the Galactic open cluster M67.
Cardiel Nicolas
Cenarro Andrés-Javier
Gorgas Javier
Vazdekis Alexandre
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