We report on sulphur abundances in halo stars as derived from near-IR UVES spectra. The importance of removing telluric lines and residual CCD fringing patterns by using early B-type stars as calibrators is emphasized. Comparison of data from the weak λ8694.6 and the stronger λ9212.9, 9237.5 pair of S I lines provides important constraints on non

In February 2007 the MAGIC Air Cherenkov Telescope for gamma-ray astronomy was fully upgraded with a ultra fast 2GSamples/s digitization system. Since the gamma-ray signals are very short, a fast readout can minimize the influence of the background from the light of the night sky. Also, the time structure of the event is an additional parameter to

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A variety of formation scenarios have been proposed to explain the diversity of properties observed in bulges. Studying their intrinsic shape can help to constrain the dominant mechanisms at the epochs of their assembly. The structural parameters of a magnitude-limited sample of 148 unbarred S0-Sb galaxies were derived in order to study the

We present preliminary results of a photometric investigation on IC10 using F555W and F814W data collected with WFPC2@HST covering two different regions. We provide a new estimate of both distance and reddening by adopting the Tip of the Red Giant Branch (TRGB). We find that the RGB stars in the two regions are located at the same distance, but

The understanding of complex stellar populations and their star formation histories relies on the stellar evolution theory as much as the improvement of our knowledge of the stellar evolution relies on the study of stellar populations. In this context, testing stellar evolution models is fundamental to properly evaluate the reliability of the