========================================================================== J/ApJ/682/1217 Abundances in red giant stars (Kirby+, 2008) The following files can be converted to FITS (extension .fit or fit.gz) table4.dat table6.dat ========================================================================== Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/682/1217 ==========================================================================
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Beginning of ReadMe : J/ApJ/682/1217 Abundances in red giants in 7 globular clusters (Kirby+, 2008) ================================================================================ Metallicity and alpha-element abundance measurement in red giant stars from medium-resolution spectra. Kirby E.N., Guhathakurta P., Sneden C. <Astrophys. J., 682, 1217-1233 (2008)> =2008ApJ...682.1217K ================================================================================ ADC_Keywords: Clusters, globular ; Abundances, [Fe/H] ; Photometry, UBVRI ; Stars, giant ; Spectroscopy Keywords: globular clusters: individual (M13, M15, M71, M79, NGC 2419, NGC 7006, NGC 7492) - stars: abundances Abstract: We present a technique that applies spectral synthesis to medium-resolution spectroscopy (MRS; R 6000) in the red (6300AA<lambda<9100AA) to measure [Fe/H] and [alpha/Fe] of individual red giant stars over a wide metallicity range. We apply our technique to 264 red giant stars in seven Galactic globular clusters and demonstrate that it reproduces the metallicities and alpha-enhancements derived from high-resolution spectroscopy (HRS). The MRS technique excludes the three CaII triplet lines and instead relies on a plethora of weaker lines. Unlike empirical metallicity estimators, such as the equivalent width of the CaII triplet, the synthetic method presented here is applicable over an arbitrarily wide metallicity range and is independent of assumptions about the alpha-enhancement. Description: We present observations of seven globular clusters with the Deep Imaging Multi-Object Spectrometer (DEIMOS) on the Keck II telescope, in 2006 Feb 2, 2007 Oct 12 and 2007 Nov 13,14,15.