Keck HIRES Spectroscopy of SkyMapper Commissioning Survey Candidate
  Extremely Metal-Poor Stars
  We present results from the analysis of high-resolution spectra obtained with
the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor
(EMP) stars originally selected from commissioning data obtained with the
SkyMapper telescope. Fourteen of the stars have not been observed previously at
high dispersion. Three have [Fe/H]<=-3.0 while the remainder, with two more
metal-rich exceptions, have -3.0<=[Fe/H]<=-2.0 dex. Apart from Fe, we also
derive abundances for the elements C, N, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn,
Co, Ni, and Zn, and for n-capture elements Sr, Ba, and Eu. None of the current
sample of stars is found to be carbon-rich. In general our chemical abundances
follow previous trends found in the literature, although we note that two of
the most metal-poor stars show very low [Ba/Fe] (~-1.7) coupled with low
[Sr/Ba] (~-0.3). Such stars are relatively rare in the Galactic halo. One
further star, and possibly two others, meet the criteria for classification as
a r-I star. This study, together with that of Jacobson et al. (2015), completes
the outcomes of the SkyMapper commissioning data survey for EMP stars.
