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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…
Lithium isotopic abundances in metal-poor halo stars
Martin Asplund, David L. Lambert, Poul Erik Nissen +2
Very high-quality spectra of 24 metal-poor halo dwarfs and subgiants have been acquired with ESO's VLT/UVES for the purpose of determining Li isotopic abundances. The derived 1D, n…
Abundances in giant stars of the globular cluster NGC 6752
David Yong, Frank Grundahl, Poul Erik Nissen +2
Recent theoretical yields and chemical evolution models demonstrate that intermediate-mass AGB stars cannot reproduce the observed abundance distributions of O, Na, Mg, and Al. As…
The [Zn/Fe] -- [Fe/H] trend for disk and halo stars
Y. Q. Chen, P. E. Nissen, G. Zhao
Zn abundances, derived from a model atmosphere analysis of the 6362.35 A ZnI line, are presented for 44 thin disk, 10 thick disk and 8 halo dwarf stars in the metallicity range -1.…
uvby(-) photometry of high-velocity and metal-poor stars X. Stars of very low metal abundance: observations, reddenings, metallicities, classifications, distances, and relative ages
W. J. Schuster, T. C. Beers, R. Michel +2
uvby(--) photometry has been obtained for an additional 411 very metal-poor stars selected from the HK survey, and used to derive basic parameters such as interstellar reddening…
Sulphur and zinc abundances in Galactic stars and damped Lyman-alpha systems
P. E. Nissen, Y. Q. Chen, M. Asplund +1
High resolution spectra of 34 halo population dwarf and subgiant stars have been obtained with VLT/UVES and used to derive sulphur abundances from the 8694.0, 8694.6 A and 9212.9,…