Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations

Cenarro, A. J.Cardiel López, NicolásVazdekis, A.Gorgas García, Francisco Javier2023-06-202023-06-202009-07-110035-871110.1111/j.1365-2966.2009.14839.xhttps://hdl.handle.net/20.500.14352/44452This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2009 The Authors. Journal compilation. © 2009 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. We acknowledge an anonymous referee for his/her very useful comments. AJC is a Juan de la Cierva Fellow of the Spanish Ministry of Science and Innovation. This work has been funded by the Spanish Ministry of Science and Innovation through grants AYA2007-67752-C03-01 and AYA2006-15698-C02-02.Using the near-infrared spectral stellar library of Cenarro et al., the behaviour of the Mg i line at 8807 A and nearby TiO bands is 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 two new indices exhibit interesting properties. In particular, MgI is 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 function 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, an [Mg/Fe] underabundance of similar to -0.04 is derived for the Galactic open cluster M67.engMg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrationsjournal articlehttp://dx.doi.org/10.1111/j.1365-2966.2009.14839.xhttp://mnras.oxfordjournals.org/open access52Infrared caii tripletStellar atmospheric parametersEvolutionary population synthesisResolution galactic spectraNewton-telescope libraryStar-formation historiesMaximum a-posterioriDigital sky surveyOld open clustersElliptic galaxiesAstrofísicaAstronomía (Física)Física atmosférica2501 Ciencias de la Atmósfera