527 citations · 2.6k across the 21 of their papers we have counts for
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HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
John E. Norris, N. Christlieb, A. J. Korn +5
We report the discovery and high-resolution, high S/N, spectroscopic analysis of the ultra-metal-poor red giant HE 0557-4840, which is the third most heavy-element deficient star c…
A non-LTE study of neutral and singly-ionized calcium in late-type stars
L. Mashonkina, A. J. Korn, N. Przybilla
Non-local thermodynamical equilibrium (NLTE) line formation for neutral and singly-ionized calcium is considered through a range of spectral types when the Ca abundance varies from…
The VLT-FLAMES Survey of Massive Stars: Observations in the Galactic Clusters NGC 3293, NGC 4755 and NGC 6611
C. J. Evans, S. J. Smartt, J. -K. Lee +23
We introduce a new survey of massive stars in the Galaxy and the Magellanic Clouds using the Fibre Large Array Multi-Element Spectrograph (FLAMES) instrument at the Very Large Tele…
HE0107-5240, A Chemically Ancient Star.I. A Detailed Abundance Analysis
N. Christlieb, B. Gustafsson, A. J. Korn +5
We report a detailed abundance analysis for HE0107-5240, a halo giant with [Fe/H]_NLTE=-5.3. This star was discovered in the course of follow-up medium-resolution spectroscopy of e…
A stellar relic from the early Milky Way
Norbert Christlieb, Michael S. Bessell, Timothy C. Beers +6
The chemical composition of the most metal-deficient stars reflects the composition of the gas from which they formed. These old stars provide crucial clues to the star formation h…
Pristine CNO abundances from Magellanic Cloud B stars I. The LMC cluster NGC 2004 with UVES
A. J. Korn, S. C. Keller, A. Kaufer +4
We present chemical abundances for four main sequence B stars in the young cluster NGC 2004 in the Large Magellanic Cloud (LMC). Apart from H II regions, unevolved OB-type stars ar…