Abundances, Stellar Parameters, and Spectra From the SDSS-III/APOGEE Survey
Abstract
The SDSS-III/APOGEE survey operated from 2011-2014 using the APOGEE spectrograph, which collects high-resolution (R~22,500), near-IR (1.51-1.70 microns) spectra with a multiplexing (300 fiber-fed objects) capability. We describe the survey data products that are publicly available, which include catalogs with radial velocity, stellar parameters, and 15 elemental abundances for over 150,000 stars, as well as the more than 500,000 spectra from which these quantities are derived. Calibration relations for the stellar parameters (Teff, log g, [M/H], [alpha/M]) and abundances (C, N, O, Na, Mg, Al, Si, S, K, Ca, Ti, V, Mn, Fe, Ni) are presented and discussed. The internal scatter of the abundances within clusters indicates that abundance precision is generally between 0.05 and 0.09 dex across a broad temperature range; within more limited ranges and at high S/N, it is smaller for some elemental abundances. We assess the accuracy of the abundances using comparison of mean cluster metallicities with literature values, APOGEE observations of the solar spectrum and of Arcturus, comparison of individual star abundances with other measurements, and consideration of the locus of derived parameters and abundances of the entire sample, and find that it is challenging to determine the absolute abundance scale; external accuracy may be good to 0.1-0.2 dex. Uncertainties may be larger at cooler temperatures (Teff<4000K). Access to the public data release and data products is described, and some guidance for using the data products is provided.
Keywords
Cite
@article{arxiv.1501.04110,
title = {Abundances, Stellar Parameters, and Spectra From the SDSS-III/APOGEE Survey},
author = {Jon A. Holtzman and Matthew Shetrone and Jennifer A. Johnson and Carlos Allende Prieto and Friedrich Anders and Brett Andrews and Timothy C. Beers and Dmitry Bizyaev and Michael R. Blanton and Jo Bovy and Ricardo Carrera and Katia Cunha and Daniel J. Eisenstein and Diane Feuillet and Peter M. Frinchaboy and Jessica Galbraith-Frew and Ana E. Garcia Perez and D. Anibal Garcia Hernandez and Sten Hasselquist and Michael R. Hayden and Fred R. Hearty and Inese Ivans and Steven R. Majewski and Sarah Martell and Szabolcs Meszaros and Demitri Muna and David L. Nidever and Duy Cuong Nguyen and Robert W. O'Connell and Kaike Pan and Marc Pinsonneault and Annie C. Robin and Ricardo P. Schiavon and Neville Shane and Jennifer Sobeck and Verne V. Smith and Nicholas Troup and David H. Weinberg and John C. Wilson and W. M. Wood-Vasey and Olga Zamora and Gail Zasowski},
journal= {arXiv preprint arXiv:1501.04110},
year = {2015}
}
Comments
29 pages, 18 figures, submitted to Astronomical Journal