We present the results of a dynamical analysis of the radio-halo cluster A2744 based on optical data. We find that this cluster is in an advanced merging phase, with two galaxy subsystems impacting along a direction close to the line- of-sight, likely observed just after the core passage.

The determination of the extinction in different directions in the Galaxy and in external galaxies is of paramount importance in several fields of astrophysics. The determination of the extinction law provides clues to the nature of the Inter/Circum-Stellar Medium (ISM/CSM), specifically to that of the dust particles. Recent studies have shown that

The successful launch of the CoRoT (COnvection, ROtation and planetary Transits) satellite opens a new era in asteroseismology. The space photometry is complemented by high-resolution spectroscopy and multicolour photometry from ground, to disclose the pulsational content of the asteroseismic targets in the most complete way. Some preliminary

We know from near-infrared imaging that bars are present in more than three quarters of local disk galaxies. Several studies have recently led to the conclusion that the fraction, as well as the properties, of bars in galaxies have not changed much from a redshift of about unity to the present day. In this paper, I will briefly review the results

The luminosity of the bulge was an important parameter in the early classification of galaxies. Later a large dispersion was found between the bulge-to-total (B/T) mass ratio and the morphological type, but B/T is still expected to have a fundamental role in the evolutionary picture of galaxies. For example the B/T, together with the shape

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