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Chemical abundances in 43 metal-poor stars
Karin Jonsell, Bengt Edvardsson, Bengt Gustafsson +3
We have derived abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Fe, Ni and Ba for 43 metal-poor field stars in the solar neighbourhood with iron abundances [Fe/H] ranging from…
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] =…
Thin and Thick Galactic Disks
Poul E. Nissen
Studies of elemental abundances in stars belonging to the thin and the thick disk of our Galaxy are reviewed. Edvardsson et al. (1993) found strong evidence of [alpha/Fe] variation…
Mg isotopic ratios in giant stars of the globular cluster NGC 6752
David Yong, Frank Grundahl, David L. Lambert +2
Mg isotopic abundance ratios are measured in 20 bright red giants in globular cluster NGC 6752 based on very high-resolution, high signal-to-noise spectra obtained with UVES on the…
CNO at the surface of low and intermediate MS stars
Poul E. Nissen
Recent studies of spectral lines of the CNO elements in the Sun and unevolved disk and halo stars show that most published abundance data may be affected by systematic errors due t…
Sulphur and iron abundances in halo stars
P. E. Nissen, Y. Q. Chen, M. Asplund +1
From equivalent widths of the SI lines at 8694 A, Israelian & Rebolo (2001) and Takada-Hidai et al. (2002) have derived a surprisingly high sulphur-to-iron ratio ([S/Fe] = 0.5 to 0…