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The Sloan Digital Sky Survey-III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) has obtained high-resolution (R ~ 22, 500), high signal-to-noise ratio (\ 100) spectra in the H-band (~1. 5--1. 7 mum) for about 146, 000 stars in the Milky Way galaxy. We have computed spectral libraries with effective temperature ({Teff}) ranging from 3500 to 8000 K for the automated chemical analysis of the survey data. The libraries, used to derive stellar parameters and abundances from the APOGEE spectra in the SDSS-III data release 12 (DR12), are based on ATLAS9 model atmospheres and the ASST spectral synthesis code. We present a second set of libraries based on MARCS model atmospheres and the spectral synthesis code Turbospectrum. The ATLAS9/ASST ({Teff} = 3500--8000 K) and MARCS/Turbospectrum ({Teff} = 3500--5500 K) grids cover a wide range of metallicity (-2. 5 -1), carbon (-1 <=slant C/M <=slant +1 dex), nitrogen (-1 <=slant N/M <=slant +1 dex), and alpha-element (-1 <=slant alpha/M <=slant +1 dex) variations, having thus seven dimensions. We compare the ATLAS9/ASST and MARCS/Turbospectrum libraries and apply both of them to the analysis of the observed H-band spectra of the Sun and the K2 giant Arcturus, as well as to a selected sample of well-known giant stars observed at very high resolution. The new APOGEE libraries are publicly available and can be employed for chemical studies in the H-band using other high-resolution spectrographs.
Zamora et al. (Tue,) studied this question.