Detection of Phosphorus, Sulphur, and Zinc in the Carbon-Enhanced
  Metal-Poor Star BD+44 493
  The carbon-enhanced metal-poor star BD+44 493 ([Fe/H]=-3.9) has been proposed
as a candidate second-generation star enriched by metals from a single Pop III
star. We report the first detections of P and S and the second detection of Zn
in any extremely metal-poor carbon-enhanced star, using new spectra of BD+44
493 collected by the Cosmic Origins Spectrograph on the Hubble Space Telescope.
We derive [P/Fe]=-0.34 +/- 0.21, [S/Fe]=+0.07 +/- 0.41, and [Zn/Fe]=-0.10 +/-
0.24. We increase by ten-fold the number of Si I lines detected in BD+44 493,
yielding [Si/Fe]=+0.15 +/- 0.22. The solar [S/Fe] and [Zn/Fe] ratios exclude
the hypothesis that the abundance pattern in BD+44 493 results from depletion
of refractory elements onto dust grains. Comparison with zero-metallicity
supernova models suggests that the stellar progenitor that enriched BD+44 493
was massive and ejected much less than 0.07 Msun of Ni-56, characteristic of a
faint supernova.
