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ABUNDANCES, STELLAR PARAMETERS, AND SPECTRA FROM THE SDSS-III/APOGEE SURVEY

Holtzman, JA and Shetrone, M and Johnson, JA and Allende Prieto, C and Anders, F and Andrews, B and Beers, TC and Bizyaev, D and Blanton, MR and Bovy, J and Carrera, R and Chojnowski, SD and Cunha, K and Eisenstein, DJ and Feuillet, D and Frinchaboy, PM and Galbraith-Frew, J and Garcia Perez, AE and Garcia-Hernandez, DA and Hasselquist, S and Hayden, MR and Hearty, FR and Ivans, I and Majewski, SR and Martell, S and Meszaros, S and Muna, D and Nidever, D and Nguyen, DC and O'Connell, RW and Pan, K and Pinsonneault, M and Robin, AC and Schiavon, RP and Shane, N and Sobeck, J and Smith, VV and Troup, N and Weinberg, DH and Wilson, JC and Wood-Vasey, WM and Zamora, O and Zasowski, G (2015) ABUNDANCES, STELLAR PARAMETERS, AND SPECTRA FROM THE SDSS-III/APOGEE SURVEY. ASTRONOMICAL JOURNAL, 150 (5). pp. 1-27. ISSN 0004-6256

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Abstract

The SDSS-III/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey operated from 2011–2014 using the APOGEE spectrograph, which collects high-resolution (R ~ 22,500), near-IR (1.51–1.70 µm) 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], [a/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; it is smaller for some elemental abundances within more limited ranges and at high signal-to-noise ratio. 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 < 4000 K). Access to the public data release and data products is described, and some guidance for using the data products is provided.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
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Date Deposited: 11 Jan 2016 10:18
Last Modified: 11 Jan 2016 10:18
DOI or Identification number: 10.1088/0004-6256/150/5/148
URI: http://researchonline.ljmu.ac.uk/id/eprint/2563

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