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The chemical composition of the peculiar companion to the millisecond pulsar in NGC 6397
E. Sabbi, R. G. Gratton, A. Bragaglia +4
We present the chemical composition of the bright companion to the millisecond pulsar J1740-5340 in NGC 6397, based on high resolution spectra. Though the large rotation velocity o…
The Helium White Dwarf orbiting the Millisecond Pulsar in the halo of the Globular Cluster NGC 6752
Francesco R. Ferraro, Andrea Possenti, Elena Sabbi +1
We have used deep high-resolution multiband images taken at the ESO Very Large Telescope to identify the optical binary companion to the millisecond pulsar (PSR J1911-5958A) locate…
The Nuclear Structure of the Sagittarius Dwarf Spheroidal Galaxy
Lorenzo Monaco, Michele Bellazzini, Francesco R. Ferraro +1
We present a study of the central parts of the Sagittarius dwarf spheroidal galaxy (Sgr). We found a clear overdensity of Sgr's stars around M~54 (hereafter NS). NS is well represe…
Blue Horizontal Branch Stars in the Sagittarius dwarf spheroidal galaxy
Lorenzo Monaco, Michele Bellazzini, Francesco R. Ferraro +1
We report on the recovery of a Blue Horizontal Branch (BHB) population belonging to the Sagittarius Dwarf Spheroidal Galaxy (Sgr). The sequence is clearly identified in the (V, V-I…
Globular Clusters in the Sgr Stream and other structures
M. Bellazzini, R. Ibata, F. R Ferraro
The possible association of Galactic globular clusters with the Sgr Stream is shortly reviewed at the light of the most recent observations of the Stream. >= 20 % of the Galactic g…
The puzzling dynamical status of the core of the globular cluster NGC 6752
F. R. Ferraro, A. Possenti, E. Sabbi +4
We have used high resolution WFPC2-HST and ground based Wide Field images to determine the center of gravity and construct an extended radial density and brightness profile of the…