Overview of the lithium problem in metal-poor stars and new results on 6Li (2008)
Cayrel, Roger, Steffen, Matthias, Bonifacio, Piercarlo, Ludwig, Hans-Günter, Caffau, Elisabetta
Two problems are discussed here. The first one is the 0.4 dex discrepancy between the 7Li abundance derived from the spectra of metal-poor halo stars on the one hand, and from Big Bang...
Overview of the lithium problem in metal-poor stars and new results on 6Li (2008)
Cayrel, Roger, Steffen, Matthias, Bonifacio, Piercarlo, Ludwig, Hans-Günter, Caffau, Elisabetta
Two problems are discussed here. The first one is the 0.4 dex discrepancy between the 7Li abundance derived from the spectra of metal-poor halo stars on the one hand, and from Big Bang...
Overview of the lithium problem in metal-poor stars and new results on 6Li (2008)
Cayrel, Roger, Steffen, Matthias, Bonifacio, Piercarlo, Ludwig, Hans-Günter, Caffau, Elisabetta
Two problems are discussed here. The first one is the 0.4 dex discrepancy between the 7Li abundance derived from the spectra of metal-poor halo stars on the one hand, and from Big Bang...
Caffau, Elisabetta, Sbordone, L., Bonifacio, P., Steffen, M., Behara, N.T.
Context: The stable element hafnium (Hf) and the radioactive element thorium (Th) were recently suggested as a suitable pair for radioactive dating of stars. The applicability of this elemental pair...
Caffau, Elisabetta, Sbordone, L., Bonifacio, P., Steffen, M., Behara, N.T.
Context: The stable element hafnium (Hf) and the radioactive element thorium (Th) were recently suggested as a suitable pair for radioactive dating of stars. The applicability of this elemental pair...
Caffau, Elisabetta, Ludwig, Hans-G., Steffen, Matthias, R. Ayres, Thomas, Bonifacio, Piercarlo, Cayrel, Roger, ...
The solar oxygen abundance has undergone a major downward revision in the last decade, the most noticeable one being the update including 3D hydrodynamical simulations to model the solar photosphere....
Caffau, Elisabetta, Ludwig, Hans-G., Steffen, Matthias, R. Ayres, Thomas, Bonifacio, Piercarlo, Cayrel, Roger, ...
The solar oxygen abundance has undergone a major downward revision in the last decade, the most noticeable one being the update including 3D hydrodynamical simulations to model the solar photosphere....
Overview of the lithium problem in metal-poor stars and new results on 6Li (2008)
Cayrel, Roger, Steffen, Matthias, Bonifacio, Piercarlo, Ludwig, Hans-Günter, Caffau, Elisabetta
Two problems are discussed here. The first one is the 0.4 dex discrepancy between the 7Li abundance derived from the spectra of metal-poor halo stars on the one hand, and from Big Bang...
Overview of the lithium problem in metal-poor stars and new results on 6Li (2008)
Cayrel, Roger, Steffen, Matthias, Bonifacio, Piercarlo, Ludwig, Hans-Günter, Caffau, Elisabetta
Two problems are discussed here. The first one is the 0.4 dex discrepancy between the 7Li abundance derived from the spectra of metal-poor halo stars on the one hand, and from Big Bang...
Caffau, Elisabetta, Ludwig, Hans-Guenter
Sulphur is an element which is formed in the alpha-process and is easily measured in the gaseous phase in external galaxies. Since it does not form dust, it is the preferred indicator for...
Sulphur abundances from the SI near-infrared triplet at 1045 nm (2007)
Caffau, Elisabetta, Faraggiana, Rosanna, Bonifacio, Piercarlo, Ludwig, Hans-G., Steffen, Matthias
context : Unlike silicon and calcium, sulphur is an alpha-element which does not form dust. Some of the available observations of the evolution of sulphur with metallicity indicate an increased...
The solar photospheric abundance of phosphorus: results from co5bold 3D model atmospheres (2007)
Caffau, Elisabetta, Steffen, Matthias, Sbordone, Luca, Ludwig, Hans-G., Bonifacio, Piercarlo
aims: We determine the solar abundance of phosphorus using co5bold 3D hydrodynamic model atmospheres. method: High resolution, high signal-to-noise solar spectra of the PI lines of Multiplet 1 at...
Line shift, line asymmetry, and the 6Li/7Li isotopic ratio determination (2007)
Cayrel, Roger, Steffen, Matthias, Chand, Hum, Bonifacio, Piercarlo, Spite, Monique, Spite, François, ...
Context: Line asymmetries are generated by convective Doppler shifts in stellar atmospheres, especially in metal-poor stars, where convective motions penetrate to higher atmospheric levels. Such...
Line shift, line asymmetry, and the 6Li/7Li isotopic ratio determination (2007)
Cayrel, Roger, Steffen, Matthias, Chand, Hum, Bonifacio, Piercarlo, Spite, Monique, Spite, François, ...
Context: Line asymmetries are generated by convective Doppler shifts in stellar atmospheres, especially in metal-poor stars, where convective motions penetrate to higher atmospheric levels. Such...
The solar photospheric abundance of phosphorus: results from co5bold 3D model atmospheres (2007)
Caffau, Elisabetta, Steffen, Matthias, Sbordone, Luca, Ludwig, Hans-G., Bonifacio, Piercarlo
aims: We determine the solar abundance of phosphorus using co5bold 3D hydrodynamic model atmospheres. method: High resolution, high signal-to-noise solar spectra of the PI lines of Multiplet 1 at...
Sulphur abundances from the SI near-infrared triplet at 1045 nm (2007)
Caffau, Elisabetta, Faraggiana, Rosanna, Bonifacio, Piercarlo, Ludwig, Hans-G., Steffen, Matthias
context : Unlike silicon and calcium, sulphur is an alpha-element which does not form dust. Some of the available observations of the evolution of sulphur with metallicity indicate an increased...
Caffau, Elisabetta, Ludwig, Hans-Guenter
Sulphur is an element which is formed in the alpha-process and is easily measured in the gaseous phase in external galaxies. Since it does not form dust, it is the preferred indicator for...