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Biases in the Main Sequence Fitting Distances to Globular Clusters based on the Hipparcos Catalogue
Eugenio Carretta, Raffaele G. Gratton, Gisella Clementini +1
We discuss the different biases affecting the sample of field subdwarfs selected from the Hipparcos Catalogue, and used in the Main Sequence Fitting technique to derive distances t…
Homogeneous photometry and metal abundances for a large sample of Hipparcos metal-poor stars
G. Clementini, R. G. Gratton, E. Carretta +1
Homogeneous photometric data (Johnson V, B-V, V-K, Cousins V-I and Stromgren b-y), radial velocities, and abundances of Fe, O, Mg, Si, Ca, Ti, Cr and Ni are presented for 99 stars…
Distances and ages of globular clusters using Hipparcos parallaxes of local subdwarfs
R. G. Gratton, E. Carretta, G. Clementini
We discuss the impact of Population II and Globular Cluster (GCs) stars on the derivation of the age of the Universe, and on the study of the formation and early evolution of galax…