We have studied the kinematics of the ionized gas in the nearly face-on galaxy NGC 3938 by means of observations made with the Fabry-Perot interferometer TAURUS II at the William Herschel Telescope, using the H_α line. We have been able to produce high-resolution velocity and velocity-dispersion maps which allow us to make a detailed study of the

We present the preliminary results obtained from two-dimensional spectroscopy with optical fibres of the circumnuclear region of the Seyfert 2 galaxy NGC 2992. The inner region of NGC 2992 seems not to be perturbed by the interaction with its companion, NGC 2993.

We report the discovery of two new field variable stars based on CCD observations carried out between October and December, 2000. Using multicolour photometry we could classify these stars as W UMa type variables, and we could determine accurate period for each of them.

Standard cosmology predicts that dwarfs were the first galaxies to be formed in the universe and that many of them merge afterward to form bigger galaxies such as the Milky Way. This process would have left behind traces such as tidal debris or star streams in the outer halo. We report here the detection of a very low density stellar system at 50+/

The discovery of a system of Herbig-Haro objects ejected by young, low mass stars in the &sigma Orionis region (Reipurth et al. 1998) has given rise to models of the photoionization of a neutral jet by an external source. We present long-slit spectra of high spectral resolution of HH 444 and numerical simulations for this Herbig-Haro object using `

We study the generation of vorticity in the magnetic boundary layer of buoyant magnetic tubes and its consequences for the trajectory of magnetic structures rising in the solar convection zone. When the Reynolds number is well above 1, the wake trailing the tube sheds vortex rolls, producing a von Kármán vortex street, similar to the case of flows