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The ages of the oldest stars in the Galaxy indicate when star formation began, and provide a minimum age for the Universe. Radioactive dating of meteoritic material1 and stars2 relies on comparing… (More)
We have investigated the poorly-understood origin of nitrogen in the early Galaxy by determining N abundances from the NH band at 336 nm in 35 extremely metal-poor halo giants, with carbon and oxygen… (More)
Context. A combined study of kinematics and chemical composition of stars is one of the most promising tools of research in Galaxy formation. The main goal in this field of research is to reconstruct… (More)
A large fraction of the carbon-enhanced, extremely metal-poor halo giants ([Fe/H] 1.9 dex and [Eu/Fe] = 2.3 dex, HE 0017+0055 is a CEMP-rs star. We used the derived atmospheric parameters and… (More)
Context. The chemical composition of extremely metal-poor stars (EMP stars; [Fe/H] < ∼− 3) is a unique tracer of early nucleosynthesis in the Galaxy. As such stars are rare, we wish to find classes… (More)