12 papers
Correlations of Globular Cluster Properties: Their Interpretations and Uses
S. G. Djorgovski, P. Cote, G. Meylan +7
Correlations among the independently measured physical properties of globular clusters (GCs) can provide powerful tests for theoretical models and new insights into their dynamics,…
A Survey of M31 Globular Clusters using WFPC2 on board HST
R. M. Rich, C. E. Corsi, M. Bellazzini +3
We report new, as yet unpublished HST/WFPC2 V, I photometry of 9 globular clusters in M31. These are part of a total sample of 19 clusters on M31 with well observed CMDs from HST.…
HST Photometry of the Fornax dSph Galaxy: cluster 4 and its field
R. Buonanno, C. E. Corsi, M. Castellani +3
Using observations from the Hubble Space Telescope archive, color-magnitude diagrams (CMDs) have been constructed for globular cluster 4 in the Fornax dSph galaxy and its surroundi…
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…
Binary stars in globular clusters: detection of a binary sequence in NGC 2808?
F. R. Ferraro, E. Carretta, F. Fusi Pecci +1
A CCD V,V-I colour-magnitude diagram (CMD) of the Galactic globular cluster NGC 2808 has been obtained with the ESO-NTT, reaching down to V ~ 24. The highly populated Main Sequence…
Distances and Absolute Ages of Galactic Globular Clusters from Hipparcos Parallaxes of Local Subdwarfs
R. G. Gratton, F. Fusi Pecci, E. Carretta +3
High precision trigonometric parallaxes from the HIPPARCOS satellite and accurate metal abundances ([Fe/H], [O/Fe], and [alpha/Fe]) from high resolution spectroscopy for about 30 l…