107 citations · 111 across the 2 of their papers we have counts for
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The first Delta a observations of three globular clusters
E. Paunzen, I. Kh. Iliev, O. I. Pintado +6
Globular clusters are main astrophysical laboratories to test and modify evolutionary models. Thought to be rather homogeneous in their local elemental Distribution of members, res…
Abundances and possible diffusion of elements in M67 stars
Anna Önehag, Bengt Gustafsson, Andreas Korn
We present a spectroscopic study at high resolution, R~50,000, of 14 stars located on the main sequence, at the turn-off point and on the early subgiant branch in the cluster M67 i…
M-dwarf metallicities - A high-resolution spectroscopic study in the near infrared
Anna Önehag, Ulrike Heiter, Bengt Gustafsson +3
The relativley large spread in the derived metallicities ([Fe/H]) of M dwarfs shows that various approaches have not yet converged to consistency. The presence of strong molecular…
M67-1194, an unusually Sun-like solar twin in M67
Anna Önehag, Andreas Korn, Bengt Gustafsson +2
The rich open cluster M67 is known to have a chemical composition close to solar, and an age around 4Gyr. It thus offers the opportunity to check our understanding of the physics a…