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    Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window

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    Cunha_2017_ApJ_844_145.pdf
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    Author
    Cunha, Katia
    Smith, Verne V.
    Hasselquist, Sten
    Souto, Diogo
    Shetrone, M. cc
    Prieto, Carlos Allende cc
    Bizyaev, Dmitry cc
    Frinchaboy, P. M. cc
    García-Hernández, D. Anibal
    Holtzman, J. cc
    Johnson, Jennifer A. cc
    Jőnsson, Henrik
    Majewski, Steven R. cc
    Mészáros, Szabolcs
    Nidever, David L. cc
    Pinsonneault, Marc cc
    Schiavon, Ricardo P.
    Sobeck, Jennifer
    Skrutskie, Michael F.
    Zamora, Olga
    Zasowski, Gail
    Fernández-Trincado, J. G.
    Show allShow less
    Affiliation
    Univ Arizona
    Issue Date
    2017-08-01
    Keywords
    stars: abundances
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window 2017, 844 (2):145 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Nine Ce II lines have been identified and characterized within the spectral window observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey (between lambda 1.51 and 1.69 mu m). At solar metallicities, cerium is an element that is produced predominantly as a result of the slow capture of neutrons (the s-process) during asymptotic giant branch stellar evolution. The Ce II lines were identified using a combination of a high-resolution (R = lambda/delta lambda = 100,000) Fourier Transform Spectrometer (FTS) spectrum of a Boo and an APOGEE spectrum (R. =. 22,400) of a metal-poor, but s-process enriched, red giant (2M16011638-1201525). Laboratory oscillator strengths are not available for these lines. Astrophysical gf-values were derived using alpha Boo as a standard star, with the absolute cerium abundance in alpha Boo set by using optical Ce II lines that have precise published laboratory gf-values. The near-infrared Ce II lines identified here are also analyzed, as consistency checks, in a small number of bright red giants using archival FTS spectra, as well as a small sample of APOGEE red giants, including two members of the open cluster NGC 6819, two field stars, and seven metal-poor N-and Al-rich stars. The conclusion is that this set of Ce II lines can be detected and analyzed in a large fraction of the APOGEE red giant sample and will be useful for probing chemical evolution of the s-process products in various populations of the Milky Way.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa7beb
    Version
    Final published version
    Sponsors
    National Science Foundation [AST1109888]; Ramon y Cajal fellowship [RYC201314182]; Spanish Ministry of Economy and Competitiveness (MINECO) [AYA201458082-P]; Premium Postdoctoral Research Program of the Hungarian Academy of Sciences; Hungarian NKFI Grants of the Hungarian National Research, Development and Innovation Office [K-119517]; National Aeronautics and Space Administration; National Science Foundation; Spanish MINECO [AYA2014-56359-P]; Birgit and Hellmuth Hertz' Foundation; Royal Physiographic Society of Lund, Sweden; Alfred P. Sloan Foundation; U.S. Department of Energy Office of Science; High-Performance Computing at the University of Utah
    Additional Links
    http://stacks.iop.org/0004-637X/844/i=2/a=145?key=crossref.7f93d9795cec3f52b6542fe8c4746f83
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa7beb
    Scopus Count
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    UA Faculty Publications

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