APOGEE Data Releases 13 and 14: Stellar Parameter and Abundance Comparisons with Independent Analyses

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Data from the SDSS-IV/Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) have been released as part of SDSS Data Releases 13 (DR13) and 14 (DR14). These include high-resolution H-band spectra, radial velocities, and derived stellar parameters and abundances. DR13, released in 2016 August, contained APOGEE data for roughly 150,000 stars, and DR14, released in 2017 August, added about 110,000 more. Stellar parameters and abundances have been derived with an automated pipeline, the APOGEE Stellar Parameter and Chemical Abundance Pipeline (ASPCAP). We evaluate the performance of this pipeline by comparing the derived stellar parameters and abundances to those inferred from optical spectra and analysis for several hundred stars. For most elements-C, Na, Mg, Al, Si, S, Ca, Cr, Mn, Ni-the DR14 ASPCAP analyses have systematic differences with the comparisons samples of less than 0.05 dex (median), and random differences of less than 0.15 dex (standard deviation). These differences are a combination of the uncertainties in both the comparison samples as well as the ASPCAP analysis. Compared to the references, magnesium is the most accurate alpha-element derived by ASPCAP, and shows a very clear thin/thick disk separation, while nickel is the most accurate iron-peak element (besides iron itself).


  • Henrik Jönsson
  • Carlos Allende Prieto
  • Jon A. Holtzman
  • Diane K. Feuillet
  • Keith Hawkins
  • Katia Cunha
  • Szabolcs Mészáros
  • Sten Hasselquist
  • J. G. Fernández-Trincado
  • D. A. Garciá-Hernández
  • Dmitry Bizyaev
  • Ricardo Carrera
  • Steven R. Majewski
  • Marc H. Pinsonneault
  • Matthew Shetrone
  • Verne Smith
  • Jennifer Sobeck
  • Diogo Souto
  • Guy S. Stringfellow
  • Johanna Teske
  • And 1 others
  • Olga Zamora
External organisations
  • Instituto de Astrofísica de Canarias
  • University of La Laguna (ULL)
  • New Mexico State University
  • Max Planck Institute for Astronomy
  • Columbia University
  • University of Texas at Austin
  • University of Arizona
  • National Observatory Brazil
  • Eötvös Loránd University
  • University of Concepción
  • University of Burgundy - Franche-Comté
  • Lomonosov Moscow State University
  • INAF - Osservatorio Astronomico di Padova
  • University of Virginia
  • Ohio State University
  • University of Washington
  • University of Colorado
  • National Optical Astronomy Observatory
  • Carnegie Institution for Science
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology
Original languageEnglish
Article number126
JournalAstronomical Journal
Issue number3
Publication statusPublished - 2018
Publication categoryResearch