Progress in the understanding of very low-mass stars and brown dwarfs has developed at a fast pace in the last decade. Several pieces of evidence indicate that these very low-mass objects form in a manner similar to stars, and hence it appears natural to that they could host planetary systems. We are carrying out studies of the binary properties of

We present results of deep echelle spectrophotometry of the brightest knot of the Herbig-Haro object HH 202 in the Orion Nebula - HH 202-S - using the Ultraviolet Visual Echelle Spectrograph in the spectral range from 3100 to 10400 Å. The high spectral resolution of the observations has permitted to separate the component associated with the

Esta tesis presenta un estudio de la población de estrellas variables en cinco galaxias aisladas del Grupo Local (GL), basado en imágenes obtenidas con el telescopio espacial Hubble (HST). Se discuten sus características en el contexto de la historia de formación estelar (HFE) de las galaxias anfitrionas. Se observaron Cetus, Tucana, IC,1613, LGS,3

We present phase resolved optical spectroscopy and photometry of V4580 Sagittarii, the optical counterpart to the accretion powered millisecond pulsar SAX J1808.4-3658, obtained during the 2008 September/October outburst. Doppler tomography of the NIII λ4640.64 Bowen blend emission line reveals a focused spot of emission at a location consistent

We present accurate new ultraviolet and optical BVI photometry for the Galactic globular cluster NGC 2808 based on both ground-based and archival Hubble Space telescope imagery. From this we have selected a sample of ~2000 Horizontal Branch (HB) stars; given the extensive wavelength range considered and the combination of both high angular

After three years since the beginning of operation, the MAGIC telescope could observe several GRB events in the prompt and early afterglow phase. Thanks to its innovative design, the telescope could promptly react to incoming GCN alerts and rapidly slew to the burst coordinates within a typical delay of 50 seconds, performing observations with an