We have used narrow emission-line data from the new 7C Redshift Survey to investigate correlations between the narrow-line luminosities and the radio properties of radio galaxies and steep-spectrum quasars. The 7C Redshift Survey is a low-frequency (151MHz) selected sample with a flux density limit about 25 times fainter than the 3CRR sample. By

An analysis of CCD spectra in the range lambda lambda4200 -8775, obtained at several positions of seven bright Galactic H Ii regions, with galactocentric distances in the range 6-10 kpc, is presented. Temperatures, densities and ionic abundances are calculated for all the positions, and the relative trends followed by these parameters are

En esta tesis la población estelar de las galaxias enanas del Grupo Local NGC 185 y Phoenix es investigada a partir de fotometría obtenida en telescopios en tierra y usando diagramas color-magnitud sintéticos. El principal resultado de esta tesis es que ambas galaxias presentan periodos largos de actividad de formación estelar y gradientes en sus

We present spectra for 12 new ultracool dwarfs found in the DENIS infrared survey. Seven of them have spectral types at the bottom of the M-class (M8-M9.5), and the other five belong to the cooler ``L'' class. We also present spectra for the two new L dwarfs found by the EROS 2 proper-motion survey. We introduce a scheme for L dwarf classification

IAUC 7307 available at Central Bureau for Astronomical Telegrams.

We present Johnson B CCD photometry for the whole sample of galaxies of the Universidad Complutense de Madrid (UCM) Survey Lists I and II (Cat. and ). They constitute a well-defined and complete sample of galaxies in the Local Universe with active star formation. The data refer to 191 S0 to Irr galaxies at an averaged redshift of 0.027, and