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Ground-based CCD astrometry with wide field imagers. III. [email protected] proper-motion catalog of the globular cluster omega Centauri
A. Bellini, G. Piotto, L. R. Bedin +6
Omega Centauri is the most well studied Globular Cluster because of its numerous puzzling features. Intensive spectroscopic follow-up observing campaigns targeting stars at differe…
Galactic Globular Cluster Relative Ages. II
F. De Angeli, G. Piotto, S. Cassisi +5
We present accurate relative ages for a sample of 55 Galactic globular clusters. The ages have been obtained by measuring the difference between the horizontal branch and the turno…
HST color-magnitude diagrams of 74 galactic globular clusters in the HST F439W and F555W bands
G. Piotto, I. R. King, S. G. Djorgovski +9
We present the complete photometric database and the color-magnitude diagrams for 74 Galactic globular clusters observed with the HST/WFPC2 camera in the F439W and F555W bands. A d…
The field of NGC 6397 as a test for Galactic models
V. Castellani, S. Degl'Innocenti, S. Petroni +1
Taking advantage of recent HST data for field stars in the region of the Galactic globular cluster NGC 6397, we tested the predictions of several Galactic models with star counts r…
Asymptotic Giant Branch predictions: theoretical uncertainties
S. Cassisi, V. Castellani, S. Degl'Innocenti +2
In this paper we investigate the level of agreement between observations and "new" Asymptotic Giant Branch (AGB) models, as produced by updating the physical inputs adopted in prev…
Photometric catalog of nearby globular clusters (II)
A. Rosenberg, A. Aparicio, I. Saviane +1
In this paper we present the second and final part of a large and photometrically homogeneous CCD color-magnitude diagram (CMD) data base, comprising 52 nearby Galactic globular cl…