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    A Search For Stars Of Very Low Metal Abundance. VI. Detailed Abundances Of 313 Metal-Poor Stars

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    Date
    2014-06
    Author
    Roederer, Ian U.
    Preston, George W.
    Thompson, Ian B.
    Shectman, Stephen A.
    Sneden, Christopher
    Burley, Gregory S.
    Kelson, Daniel D.
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    Abstract
    We present radial velocities, equivalent widths, model atmosphere parameters, and abundances or upper limits for 53 species of 48 elements derived from high resolution optical spectroscopy of 313 metal-poor stars. A majority of these stars were selected from the metal-poor candidates of the HK Survey of Beers, Preston, and Shectman. We derive detailed abundances for 61% of these stars for the first time. Spectra were obtained during a 10 yr observing campaign using the Magellan Inamori Kyocera Echelle spectrograph on the Magellan Telescopes at Las Campanas Observatory, the Robert G. Tull Coude Spectrograph on the Harlan J. Smith Telescope at McDonald Observatory, and the High Resolution Spectrograph on the Hobby-Eberly Telescope at McDonald Observatory. We perform a standard LTE abundance analysis using MARCS model atmospheres, and we apply line-by-line statistical corrections to minimize systematic abundance differences arising when different sets of lines are available for analysis. We identify several abundance correlations with effective temperature. A comparison with previous abundance analyses reveals significant differences in stellar parameters, which we investigate in detail. Our metallicities are, on average, lower by approximate to 0.25 dex for red giants and approximate to 0.04 dex for subgiants. Our sample contains 19 stars with [Fe/H] <= -3.5, 84 stars with [Fe/H] <= -3.0, and 210 stars with [Fe/H] <= -2.5. Detailed abundances are presented here or elsewhere for 91% of the 209 stars with [Fe/H] <= -2.5 as estimated from medium resolution spectroscopy by Beers, Preston, and Shectman. We will discuss the interpretation of these abundances in subsequent papers.
    Department
    Astronomy
    Subject
    galaxy: halo
    nuclear reactions, nucleosynthesis, abundances
    stars:
    abundances
    stars: atmospheres
    stars: population ii
    laboratory transition-probabilities
    neutron-capture elements
    r-process-rich
    hobby-eberly-telescope
    horizontal-branch stars
    experimental oscillator-strengths
    high-dispersion-spectrograph
    effective temperature scale
    deficient red giants
    proper-motion stars
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34430
    Citation
    Roederer, Ian U., George W. Preston, Ian B. Thompson, Stephen A. Shectman, Christopher Sneden, Gregory S. Burley, and Daniel D. Kelson. >A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars.> The Astronomical Journal, Vol. 147, No. 6 (Jun., 2014): 136.
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    • facebook
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    © The University of Texas at Austin