We present the results of a set of three-dimensional numerical simulations of magnetic flux emergence from below the photosphere and into the corona. The corona includes a uniform and horizontal magnetic field as a model for a preexisting large-scale coronal magnetic system. Cases with different relative orientations of the upcoming and coronal

We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of very low mass stars and brown dwarfs. The secondary of this previously known binary system shows a clear elongation on six images obtained at six different epochs. Significant residuals remain after point-spread function (PSF) subtraction

A new scenario is proposed in which the continuous creation of stars results into a highly concentrated massive (globular cluster-like) stellar system. We show that under very general conditions a large-scale gravitational instability in the ISM that triggers the collapse of a massive cloud leads with the aid of newly-formed stars to a standing

Using the VLA and the VLBA we have observed water maser emission in the proto-planetary nebula candidate IRAS 19134+2131, in which the water maser spectrum has double radial-velocity peaks separated by ˜100 km s-1. The main purpose of this study is to reveal the 3-D kinematics of the masers in detail, which indicates a fast ( ˜110 km s-1) bipolar

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We have investigated the nature of the energy source of 36 LINERs with Chandra X-ray observations selected from the catalogue by Carrillo et al. (1999). In most galaxies a nuclear compact source has been detected in the hard band (2-8 KeV). However they show a rather irregular morphology embedded in diffuse X-ray emission for lower energies (0.3-2