126 citations · 174 across the 2 of their papers we have counts for
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Uncovering the Chemical Signature of the First Stars in the Universe
Torgny Karlsson, Jarrett L. Johnson, Volker Bromm
The chemical abundance patterns observed in metal-poor Galactic halo stars contain the signature of the first supernovae, and thus allows us to probe the first stars that formed in…
Primordial Stellar Feedback and the Origin of Hyper Metal-Poor Stars
Torgny Karlsson
The apparent absence of stars in the Milky Way halo with -5 ~< [Fe/H] ~< -4 suggests that the gas out of which the halo stars were born experienced a period of low or delayed star…
Stochastic chemical enrichment in metal-poor systems II. Abundance ratios and scatter
T. Karlsson, B. Gustafsson
A stochastic model of the chemical enrichment of metal-poor systems by core-collapse supernovae is used to study the scatter in stellar abundance ratios. The resulting scatter in a…
Stochastic chemical enrichment in metal-poor systems I. Theory
T. Karlsson
A stochastic model of the chemical enrichment of metal-poor systems by core-collapse (Type II) supernovae is presented, allowing for large-scale mixing of the enriched material by…
Abundances In Very Metal Poor Dwarf Stars
Judith G. Cohen, Norbert Christlieb, Andrew McWilliam +7
We discuss the detailed composition of 28 extremely metal-poor dwarfs, 22 of which are from the Hamburg/ESO Survey, based on Keck Echelle spectra. Our sample has a median [Fe/H] of…
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…