• DOI:10.1088/0004-637X/706/2/1095
• Corpus ID: 118366499

CHEMICAL COMPOSITIONS OF KINEMATICALLY SELECTED OUTER HALO STARS

@article{Zhang2009CHEMICALCO,
  title={CHEMICAL COMPOSITIONS OF KINEMATICALLY SELECTED OUTER HALO STARS},
  author={Lan Zhang and Miho N. Ishigaki and Wako Aoki and Gang Zhao and Masashi Chiba},
  journal={The Astrophysical Journal},
  year={2009},
  volume={706},
  pages={1095 - 1113}
}

• Lan Zhang, M. Ishigaki, +2 authors M. Chiba
• Published 1 July 2009
• Physics
• The Astrophysical Journal

Chemical abundances of 26 metal-poor dwarfs and giants are determined from high-resolution and high signal-to-noise ratio spectra obtained with the Subaru/High Dispersion Spectrograph. The sample is selected so that most of the objects have outer-halo kinematics. Self-consistent atmospheric parameters were determined by an iterative procedure based on spectroscopic analysis. Abundances of 13 elements, including α-elements (Mg, Si, Ca, Ti), odd-Z light elements (Na, Sc), iron-peak elements (Cr, Mn, Fe, Ni, Zn), and neutron-capture elements (Y, Ba), are determined by two independent data reduction and local thermodynamic equillibrium analysis procedures, confirming the consistency of the stellar parameters and abundances results. We find a decreasing trend of [α/Fe] with increasing [Fe/H] for the range of −3.5< [Fe/H] <−1, as found by Stephens & Boesgaard. [Zn/Fe] values of most objects in our sample are slightly lower than the bulk of halo stars previously studied. These results are discussed as possible chemical properties of the outer halo in the Galaxy.