We report a study of the quiet sun's magnetic field based on high-resolution infrared spectropolarimetric observations (TIP/VTT). We find that in almost 50% of the pixels Stokes V and in 15% the Stokes Q and/or U profiles have a signal above 10-3. The statistical properties of the mainly intranetwork field sampled by these observations are

The real-colour images of spiral galaxies reproduced in this Newsletter form part of a new series of such pictures, currently under construction. The original images used have all been obtained with the ING telescopes, mostly with the JKT, some with the INT, and an occasional (H-alpha) image with the WHT. For each galaxy, we have images in the B

El problema del tamaño y distribución de tamaños de los núcleos se ha estudiado en los cometas de la familia de Júpiter (FJ). Se han compilado las magnitudes nucleares publicadas de los FJ en un Catálogo, que incluye observaciones entre 1990 y 1995. Este catálogo es la primera compilación global y detallada de magnitudes nucleares de diferentes

Hot spots (HSs) are regions of enhanced radio emission produced by supersonic jets at the tip of the radio lobes of powerful radio sources. Obtained with the Very Large Telescope (VLT), images of the HSs in the radio galaxy 3C 445 show bright knots embedded in diffuse optical emission distributed along the post-shock region created by the impact of

Once the need for an iterative procedure in order to solve the problem of the formation of spectral lines in the case of a model atom with many energy levels, the sequel is to seek for the most effective form of such an iterative scheme. It is an almost universal is assumed within all the iterative methods for the solution of those radiative

We present 29 mid-infrared spectra of the zodiacal light distributed over the sky. The observed 5.9-11.7 mu m spectral shapes are well represented by blackbody radiation with colour temperatures in the range of 255