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We are using both space-based (Hubble Space Telescope, HST) and ground-based telescopes to make extensive studies of Galactic halo stars. These stars contain the nucleosynthesis products (from the rapid neutron capture process, i.e., the r- process) from the earliest generations of stars - the progenitors of the halo stars. The observed stellar abundance distributions - from the lightest neutron-capture elements, such as Ge, along with some of the heaviest, including Pt - are providing new clues about the earliest Galactic r-process nucleosynthesis. These in turn will help to identify the characteristics and nature of the first stars in the Galaxy.

Abundance Signatures in Halo Stars: Clues to Nucleosynthesis in the First Stars