489 citations · 3.3k across the 59 of their papers we have counts for
29 papers · 1 filter
NLTE analysis of the methylidyne radical (CH) molecular lines in metal-poor stellar atmospheres
S. A. Popa, R. Hoppe, M. Bergemann +3
An analysis of the CH molecule in non-local thermodynamic equilibrium (NLTE) is performed for the physical conditions of cool stellar atmospheres typical of red giants (log g = 2.0…
Heavy Elements -- They came out of the blue
Camilla Juul Hansen
How are the heavy elements formed? This has been a key open question in physics for decades. Recent direct detections of neutron star mergers and observations of evolved stars show…
Mono-enriched stars and Galactic chemical evolution -- Possible biases in observations and theory
Camilla Juul Hansen, Andreas Koch, Lyudmila Mashonkina +9
A long sought after goal using chemical abundance patterns derived from metal-poor stars is to understand the Galactic chemical evolution (GCE) and to pin down the nature of the fi…
The Gaia-ESO survey: 3D NLTE abundances in the open cluster NGC 2420 suggest atomic diffusion and turbulent mixing at the origin of chemical abundance variations
Ekaterina Semenova, Maria Bergemann, Morgan Deal +10
Atomic diffusion and mixing processes in stellar interiors influence the structure and the surface composition of stars. Some of these processes cannot yet be modelled from the fir…
A wide angle view of the Sagittarius dwarf spheroidal galaxy -- II. A CEMP-r/s star in the Sagittarius dwarf Spheroidal Galaxy
L. Sbordone, C. J. Hansen, L. Monaco +5
We report on the discovery and chemical abundance analysis of the first CEMP-r/s star detected in the Sagittarius dwarf Spheroidal Galaxy, by means of UVES high resolution spectra.…
A high-precision abundance analysis of the nuclear benchmark star HD 20
Michael Hanke, Camilla Juul Hansen, Hans-Günter Ludwig +4
We present our chemical abundance investigation of the metal-poor ([Fe/H]=-1.60 dex), r-process-enriched ([Eu/Fe]=0.73 dex) halo star HD 20 using novel and archival high-resolution…