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



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Cenarro, A. J. and Cardiel López, Nicolás and Vazdekis, A. and Gorgas García, Francisco Javier (2009) Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations. Monthly notices of the Royal Astronomical Society, 396 (4). pp. 1895-1914. ISSN 0035-8711

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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.

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This 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.

Uncontrolled Keywords:Infrared caii triplet; Stellar atmospheric parameters; Evolutionary population synthesis; Resolution galactic spectra; Newton-telescope library; Star-formation histories; Maximum a-posteriori; Digital sky survey; Old open clusters; Elliptic galaxies
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
Sciences > Physics > Atmospheric physics
ID Code:28028
Deposited On:26 Jan 2015 16:26
Last Modified:10 Dec 2018 15:05

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