We have observed a sample of "ordinary" quasars, selected only on the grounds of their relative brightness in the visible, with the Turku Photopolarimeter on the 2.56m Nordic Optical Telescope, on La Palma, Canary Islands. The instrument permits us to obtain simultaneous UBVRI photometry and polarimetry of objects down to 16th magnitude, with the

A detailed insight into the star formation history of a sample of HII galaxies has been obtained, based on radio continuum and optical broad band and narrow band observations. HII galaxies are dwarf galaxies whose optical spectrum resembles that of HII regions, many of which are also known as Blue Compact Dwarf Galaxies. VLA observations at several

The radio properties of low surface brightness (LSB) dwarf galaxies are still largely unknown. To help remedying this situation we observed twelve LSB dwarfs with the VLA at lambda = 3.6 cm and lambda = 20 cm. All galaxies are included in the UGC catalog and have previously claimed radio continuum detections at either 21 cm (Altschuler et al. 1984

The Owl Nebula (NGC 3587) is a double shell nebula. An additional faint halo is recently found in interference filter CCD images (Kwitter, Chu, & Downes 1992, in IAU Symp. 155). To confirm and to determine the physical nature of this halo, we have obtained spectra of the Owl Nebula with the IDS spectrograph on the INT 2.5m telescope at La Palma

SE PRESENTA UN ESTUDIO OBSERVACIONAL DE PROCESOS DE FORMACION ESTELAR EN GRAN ESCALA EN GALAXIAS ESPIRALES CON BRAZOS BIEN DEFINIDOS. SE HA OBSERVADO NOC 4321 EN 21 CM HI, J=1 0 CO Y H Y USADO DATOS DE LA LITERATURA PARA M51. DE UN ANALISIS DE LA EFICIENCIA DE FORMACION DE ESTRELLAS MASIVAS (MSFE) SIGUIENDO LOS BRAZOS PRINCIPALES DE ESTAS GALAXIAS

On the basis of a sample of Virgo cluster galaxies in a larger set of heterogeneous literature data, it is shown that ellipticals, early-type dwarfs, and bulges of S0s and of spirals form two distinct families in the plane of the effective parameters, R(e) and mu(e). The 'ordinary' family is composed of all galaxies fainter than MB of about -19.3