209 citations · 596 across the 4 of their papers we have counts for
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The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars
D. Fabbian, P. E. Nissen, M. Asplund +2
We present new measurements of the abundances of carbon and oxygen derived from high-excitation C I and O I absorption lines in metal-poor halo stars, with the aim of clarifying th…
Sulphur and zinc abundances in Galactic halo stars revisited
P. E. Nissen, C. Akerman, M. Asplund +4
High resolution UVES spectra of 40 main-sequence stars with -3.3 < [Fe/H] < -1.0 are used to derive S, Fe and Zn abundances from lines in the 400 - 950 nm region. For one star we a…
Zn and Cr abundances in damped Lyman alpha systems from the CORALS survey
Chris J. Akerman, Sara L. Ellison, Max Pettini +1
We present metal abundances in 15 damped Lyman alpha systems (DLAs) from the Complete Optical and Radio Absorption Line System (CORALS) survey, designed to be free from any biasing…
The evolution of the C/O ratio in metal-poor halo stars
Chris J. Akerman, Leticia Carigi, Poul E. Nissen +2
We report new measurements of carbon and oxygen abundances in 34 F and G dwarf and subgiant stars belonging to the halo population and spanning a range of metallicity from [Fe/H] =…