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    New Abundance Determinations of Cadmium, Lutetium, and Osmium in the R-Process Enriched Star BD+17 3248

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    Date
    2010-05
    Author
    Roederer, Ian U.
    Sneden, Christopher
    Lawler, James E.
    Cowan, John J.
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    Abstract
    We report the detection of Cd I (Z = 48), Lu II (Z = 71), and Os II (Z = 76) in the metal-poor star BD + 17 3248. These abundances are derived from an ultraviolet spectrum obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. This is the first detection of these neutron-capture species in a metal-poor star enriched by the r process. We supplement these measurements with new abundances of Moi, Rui, and Rh i derived from an optical spectrum obtained with the High Resolution Echelle Spectrograph on Keck. Combined with previous abundance derivations, 32 neutron-capture elements have been detected in BD + 17 3248, the most complete neutron-capture abundance pattern in any metal-poor star to date. The light neutron-capture elements (38 <= Z <= 48) show a more pronounced even-odd effect than expected from current solar system r-process abundance predictions. The age for BD + 17 3248 derived from the Th ii/Os II chronometer is in better agreement with the age derived from other chronometers than the age derived from Th ii/Os i. NewHf II abundance derivations from transitions in the ultraviolet are lower than those derived from transitions in the optical, and the lower Hf abundance is in better agreement with the scaled solar system r-process distribution.
    Department
    Astronomy
    Subject
    nuclear reactions, nucleosynthesis, abundances
    stars: abundances
    stars: individual (bd+17 3258, hd 122563)
    stars: population ii
    metal-poor stars
    laboratory transition-probabilities
    theoretical
    radiative lifetimes
    neutron-capture elements
    giant branch stars
    oscillator-strengths
    early galaxy
    astrophysical interest
    heavy-elements
    process-rich
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/42957
    xmlui.dri2xhtml.METS-1.0.item-citation
    Roederer, Ian U., Christopher Sneden, James E. Lawler, and John J. Cowan. "NEW ABUNDANCE DETERMINATIONS OF CADMIUM, LUTETIUM, AND OSMIUM IN THE r-PROCESS ENRICHED STAR BD+ 17 3248Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs 8111 and 8342., Some of the data presented herein were obtained at the WM Keck Observatory, which is operated as a ...." The Astrophysical Journal Letters, Vol. 714, No. 1 (May, 2010): L123.
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