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Context: Small-scale magnetic fields play an important role in the structure and the dynamics of the solar atmosphere. Aims: This study aims at revealing the evolution of magnetic fields, together with granular convection in the quiet Sun by means of observations with high spatial, spectral, and temporal resolution and of numerical MHD simulations

We present preliminary astrometric results for the closest known brown dwarf binary to the Sun: V Indi Ba, Bb at a distance of 3.626 pc. With ongoing monitoring of the relative separation of the two brown dwarfs (spectral types T1 and T6) with VLT NACO near-IR adaptive optics system since June 2004, we obtain a model-independent dynamical total

Equipartition of energy between relativistic particles and magnetic field is known to be consistent with observations in most of the large size (hundreds of kpc) radio galaxies. Here we discuss whether such a property holds in the smallest and youngest radio sources, the High Frequency Peakers (HFPs). A few sources have small components with a

Context: The source 4U 2206+54 is one of the most enigmatic high-mass X-ray binaries. In spite of intensive searches, X-ray pulsations have not been detected in the time range 10-3-103 s. A cyclotron line at ~30 keV has been suggested by various authors but never detected with significance. The stellar wind of the optical companion is abnormally

We present the discovery of a 14-8+2 MJup companion located at 670 AU from UScoC-TIO 108, a 60+/-20 MJup brown dwarf of the very young Upper Scorpius association. Optical and near-infrared photometry and spectroscopy confirm that both the primary and secondary are very cool objects, with Teff of 2700 and 2100 K, respectively, and that they are bona