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ASPCAP: The Apogee Stellar Parameter and Chemical Abundances Pipeline | Ana E. García Pérez
; Carlos Allende Prieto
; Jon A. Holtzman
; Matthew Shetrone
; Szabolcs Mészáros
; Dmitry Bizyaev
; Ricardo Carrera
; Katia Cunha
; D. A. García-Hernández
; Jennifer A. Johnson
; Steven R. Majewski
; David L. Nidever
; Ricardo P. Schiavon
; Neville Shane
; Verne V. Smith
; Jennifer Sobeck
; Nicholas Troup
; Olga Zamora
; Jo Bovy
; Daniel J. Eisenstein
; Diane Feuillet
; Peter M. Frinchaboy
; Michael R. Hayden
; Fred R. Hearty
; Duy C. Nguyen
; Robert W. O'Connell
; Marc H. Pinsonneault
; David H. Weinberg
; John C. Wilson
; Gail Zasowski
; | Date: |
26 Oct 2015 | Abstract: | The Apache Point Observatory Galactic Evolution Experiment (APOGEE) has built
the largest moderately high-resolution (R=22, 500) spectroscopic map of the
stars across the Milky Way, and including dust-obscured areas. The APOGEE
Stellar Parameter and Chemical Abundances Pipeline (ASPCAP) is the software
developed for the automated analysis of these spectra. ASPCAP determines
atmospheric parameters and chemical abundances from observed spectra by
comparing observed spectra to libraries of theoretical spectra, using chi-2
minimization in a multidimensional parameter space. The package consists of a
fortran90 code that does the actual minimization, and a wrapper IDL code for
book-keeping and data handling. This paper explains in detail the ASPCAP
components and functionality, and presents results from a number of tests
designed to check its performance. ASPCAP provides stellar effective
temperatures, surface gravities, and metallicities precise to 2%, 0.1 dex, and
0.05 dex, respectively, for most APOGEE stars, which are predominantly giants.
It also provides abundances for up to 15 chemical elements with various levels
of precision, typically under 0.1 dex. The final data release (DR12) of the
Sloan Digital Sky Survey III contains an APOGEE database of more than 150,000
stars. ASPCAP development continues in the SDSS-IV APOGEE-2 survey. | Source: | arXiv, 1510.7635 | Services: | Forum | Review | PDF | Favorites |
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