Chemical abundances of 26 metal-poor dwarfs and giants are determined from high-resolution and high signal-to-noise ratio spectra obtained with Subaru/HDS .
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 \alpha -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 LTE analysis procedures , confirming the consistency of the stellar parameters and abundances results .
We find a decreasing trend of [ \alpha /Fe ] with increasing [ Fe/H ] for the range of -3.5 < [ Fe/H ] < -1 , as found by Stephens and Boesgaard ( 2002 ) .
[ 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 .