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Deep HST-WFPC2 photometry of NGC 288. I. Binary Systems and Blue Stragglers
M. Bellazzini, F. Fusi Pecci, M. Messineo +2
We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribut…
Wide Field Imaging of the Sextans Dwarf Spheroidal Galaxy
E. Pancino, M. Bellazzini, F. R. Ferraro
We present wide field multiband photometry of the very low surface brightness dwarf Spheroidal galaxy (dSph) Sextans. We have found convincing evidence for the presence of multiple…
A new calibration of the RGB Tip as a Standard Candle
Michele Bellazzini, Francesco R. Ferraro, Elena Pancino
We have obtained an accurate estimate of the absolute I magnitude of the Tip of the Red Giant Branch (M_I(TRGB)) for the globular cluster Omega Cen, based {\em (a)} on the largest…
Age as the Second Parameter in NGC 288 / NGC 362? I. Turnoff Ages: a Purely Differential Comparison
M. Bellazzini, F. Fusi Pecci, F. R. Ferraro +3
We present deep V,I photometry of the globular clusters NGC 288, NGC 362 and NGC 1851 obtained during a single observational run under strictly homogeneous conditions. We use the b…
Age as the Second Parameter in NGC 288/NGC 362? II. The Horizontal Branch Revisited
M. Catelan, M. Bellazzini, W. B. Landsman +3
We revisit the "second parameter" pair of globular clusters NGC 288/NGC 362 on the basis of theoretical models for red giant branch (RGB) and horizontal branch (HB) stars. The resu…
RR Lyrae Variables in the Globular Clusters of M31: a First Detection of Likely Candidates
G. Clementini, L. Federici, C. E. Corsi +3
The purpose of this paper is to show that RR Lyrae variables exist and can be detected in M31 globular clusters. We report on the first tentative identification of RR Lyrae candida…