Empirical calibration of the near-infrared Ca ii triplet — I. The stellar library and index definition

By A. Cenarro, N. Cardiel, J. Gorgas, Reynier Peletier, A. Vazdekis, F. Madrid, Spain., U. Nottingham, UK., Instituto de Astrof'isica de Canarias and 2 more. 2001

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A new stellar library at the near-IR spectral region developed for the empirical calibration of the Ca II triplet and stellar population synthesis modelling is presented. The library covers the range lambda lambda 8348-9020 at 1.5-Angstrom (FWHM) spectral resolution, and consists of 706 stars spanning a wide range in atmospheric parameters. We have defined a new set of near-IR indices, CaT*, CaT and PaT, which mostly overcome the limitations of previous definitions, the former being specially suited for the measurement of the Ca II triplet strength corrected for the contamination from Paschen lines. We also present a comparative study of the new and the previous Ca indices, as well as the corresponding transformations between the different systems. A thorough analysis of the sources of index errors and the procedure to calculate them is given. Finally, index and error measurements for the whole stellar library are provided together with the final spectra.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/0668b18e2c2028328681201b0e6ddbe3ba9beeec

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Citations in the corpus

Modeling the Panchromatic Spectral Energy Distributions of Galaxies (2013, background): “Other index systems have been defined at other wavelengths (e.g., Fanelli et al. 1992, Alvarez et al. 2000, Cenarro et al. 2001, Serven, Worthey & Briley 2005).”
THE SEGUE STELLAR PARAMETER PIPELINE. II. VALIDATION WITH GALACTIC GLOBULAR AND OPEN CLUSTERS (2007, methodology): “…(Bailer-Jones 2000; Willemsen et al. 2005; Re Fiorentin et al. 2007), autocorrelation analysis (Beers et al. 1999), and a variety of line index calculations based on previous calibrations with respect to known standard stars (Beers et al. 1999; Cenarro et al. 2001a, 2001b; Morrison et al. 2003).”
Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters (2006, methodology): “The atmospheric parameters have been derived from values in the literature, transforming them to a homogeneous system following Cenarro et al. (2001b).”
THE SEGUE STELLAR PARAMETER PIPELINE. I. DESCRIPTION AND COMPARISON OF INDIVIDUAL METHODS (2007, background): “…analysis of a stellar spectrum (Beers et al. 1999, and references therein), obtaining fits of spectral lines (or summed line indices) as a function of broadband colors (Wilhelm et al. 1999), or the behavior of the Ca II triplet lines as a function of broadband color (Cenarro et al. 2001a,b).”
On the nature and evolution of the unique binary pulsar J1903+0327 (2010, background): “At these wavelengths the most common spectral lines are those belonging to the Ca ii triplet, and the Paschen series of Hydrogen (see Cenarro et al. 2001).”
Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions (2016, background): “…parameters (e.g. Bruzual & Charlot 2003; Vazdekis et al. 2010; Maraston & Strömbäck 2011; Conroy & van Dokkum 2012); (ii) individual empirical (e.g. Cenarro et al. 2001; Prugniel & Soubiran 2001; Valdes et al. 2004; Sánchez-Blázquez et al. 2006) or synthetic (e.g. Coelho et al. 2005; Munari et al.…”
New fully empirical calibrations of strong-line metallicity indicators in star forming galaxies (2016, methodology): “(0000) CAT library of spectral templates (Vazdekis et al. 2012; Ricciardelli et al. 2012), an extension of the previous MILES library (Falcón-Barroso et al. 2011; Cenarro et al. 2001; Vazdekis et al. 2010; Sánchez-Blázquez et al. 2006) in which both Indo-U.”
DISCOVERY OF A FAINT COMPANION TO ALCOR USING MMT/AO 5 μm IMAGING (2009, background): “…(2007), distance is inverse of parallax, (2) Gontcharov (2006), (3) Kidger & Mart́ın-Luis (2003), (4) mean value from Blackwell & Lynas-Gray (1998), Cenarro et al. (2001), Gray et al. (2003), and Le Borgne et al. (2003), (5) Gray & Garrison (1989), (6) from adopted Teff and tables of Flower…”
Exploring Halo Substructure with Giant Stars. XI. The Tidal Tails of the Carina Dwarf Spheroidal Galaxy and the Discovery of Magellanic Cloud Stars in the Carina Foreground (2006, methodology): “…the code used to measure the line strength in- 20 Note that two of the fifteen moving group stars lie just outside our more conservative giant selection criteria, and were part of the experimental foray into this region with the MIKE sample discussed in §3.1. dices (Cenarro et al. 2001a,b).”
MIUSCAT: extended MILES spectral coverage – I. Stellar population synthesis models (2012, methodology): “…coverage of our MILES-based models (Vazdekis et al. 2010) we employ three empirical stellar libraries at moderately-high spectral resolution: MILES (Sánchez-Blázquez et al. 2006) and the near-IR CaT library of Cenarro et al. (2001), both with very good relative fluxcalibration, and the Indo-U.”
Evolutionary population synthesis: models, analysis of the ingredients and application to high‐z galaxies (2004, methodology): “The equivalent width of the triplet absorption line of calcium at 8600 Å (CaII) is computed adopting the index definition by Cenarro et al. (2001a).”
The Indo-US Library of Coudé Feed Stellar Spectra (2004, background): “Finally, Cenarro et al. (2001) have observed 706 stars in the wavelength region 8350–9020 8 at 1.5 8 resolution, to characterize the behavior of the near-IR Ca ii triplet for galaxy population synthesis.”
Higher‐order Balmer line indices in α/Fe‐enhanced stellar population models (2004, background): “In the work of Tripicco & Bell (1995), recently defined absorption line indices like th higherorder Balmer lines (Worthey & Ottaviani 1997) or the CaII triplet (Cenarro et al. 2001) are not included.”
SPIDER VIII - constraints on the stellar initial mass function of early-type galaxies from a variety of spectral features (2013, methodology): “Here, the CaT is defined as CaT=Ca1+Ca2+Ca3, following the definition of Cenarro et al. (2001).”
Evolutionary synthesis of galaxies at high spectral resolution with the code PEGASE-HR. Metallicity and age tracers (2004, methodology): “Recently, the Vazdekis & Arimoto (1999) model has been coupled to the Ca ii library of Cenarro et al. (2001) to determine the LOSVD profiles of bulges of spiral galaxies (Falcón-Barroso et al. 2003).”
UV-extended E-MILES stellar population models: young components in massive early-type galaxies (2016, methodology): “It has been only recently that, by means of empirical stellar libraries (e.g. Cenarro et al. 2001a; Cushing, Raynier & Vacca 2005; Raynier, Cushing & Vacca 2009), we have at disposal SSP spectra at higher resolutions (e.g. Vazdekis et al. 2003; Conroy & van Dokkum 2012a; Meneses-Goytia et al. 2015;…”
Automatic determination of stellar atmospheric parameters and construction of stellar spectral templates of the Guoshoujing Telescope (LAMOST) (2011, methodology): “…methods, like correlations between broadband colors or the strength of prominent metallic lines and the atmospheric parameters(Beers et al. 1999; Wilhelm et al. 1999; Cenarro et al. 2001ab; Alonso et al. 1996ab; Alonso et al. 1999ab; Ivezíc et al. 2008; An et al. 2009; Arnadóttir et al. 2010).”