P. G. Willemsen

TL;DR: In this article, the authors used a homogeneous data set of hundreds of medium-resolution spectra of stars in eight Galactic globular clusters (M 15, M 22, M 55, NGC 288 and NGC 362) to understand the origin of CNO-anomalies.

TL;DR: For the first time, the abundances of a large sample of subgiant and turn-off region stars in omega Centauri have been measured, the data base being medium resolution spectroscopy from FORS2 at the VLT as discussed by the authors.

TL;DR: For the first time, the abundances of a large sample of subgiant and turn-off region stars in ω Centauri have been measured, the data base being medium resolution spectroscopy from FORS2 at the VLT.

TL;DR: In this paper, the photometric capabilities for characterizing the luminosity, temperature, gravity and chemical composition of stars are analyzed for a large number of observations involved, for objects located throughout the entire Hertzsprung-Russell diagram.

TL;DR: In this article, the broad and medium-band set of photometric filters adopted as the baseline for the European Gaia astrometry mission is presented, along with the criteria and the methodology on which this choice has been based.