SPECTROSCOPIC STUDIES OF EXTREMELY METAL-POOR STARS WITH THE SUBARU HIGH DISPERSION SPECTROGRAPH. V. THE Zn-ENHANCED METAL-POOR STAR BS 16920-017

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Abstract

We report Zn abundances for 18 very metal-poor stars studied in our previous work, covering the metallicity range –3.2< [Fe/H] <–2.5. The [Zn/Fe] values of most stars show an increasing trend with decreasing [Fe/H] in this metallicity range, confirming the results found by previous studies. However, the extremely metal-poor star BS 16920-017([Fe/H] =–3.2) exhibits a significantly high [Zn/Fe] ratio ([Zn/Fe] = +1.0). Comparison of the chemical abundances of this object with HD 4306, which has similar atmospheric parameters to BS 16920-017, clearly demonstrates a deficiency of α elements and neutron-capture elements in this star, along with enhancements of Mn and Ni, as well as Zn. The association with a hypernova explosion that has been proposed to explain the high Zn abundance ratios found in extremely metal-poor stars is a possible explanation, although further studies are required to fully interpret the abundance pattern of this object.

Journal

  • The Astrophysical Journal

    The Astrophysical Journal 730(2), 2011-04-01

    IOP Publishing

Codes

  • NII Article ID (NAID)
    120003018498
  • NII NACSIS-CAT ID (NCID)
    AA00553242
  • Text Lang
    ENG
  • Article Type
    journal article
  • ISSN
    0004-637X
  • Data Source
    IR 
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