Observations of three post-Main-Sequence nebulae, taken with an intermediate dispersion spectrograph mounted on the 2.5 m Isaac Newton Telescope (La Palma, Spain), are presented. The results reveal evidence for high-velocity outflows of about 100 km/s in the primary shells, and very much greater velocities in the cores, while in one unique source

The first results of a program of observations designed to probe the structure and kinematics of the Local Interstellar Medium (LISM) using the Queen's University of Belfast Echelle Spectrograph (QUBES) on the 4.2 m William Herschel Telescope are reported. The observations show the potential of the instrument for measuring small column densities

The experimental fiber-optic spectrograph FLEX being developed for the 4.2-m William Herschel Telescope (WHT) at Tenerife is briefly described and illustrated with a drawing. FLEX is designed to serve as an interim general-purpose spectrograph on the WHT before ISIS becomes operational and as a testbed for future instruments. Essentially, the UNIT

EL TRABAJO PRESENTA UN ESTUDIO DE 6 REGIONES DE FORMACION ESTELAR ASOCIADAS A ALGUNAS NEBULOSIDADES CANDIDATAS A OBJETOS HERBIG-HARO (NEBULOSIDADES GGD) Y LOS OBJETOS ESTELARES JOVENES (OEJS) ASOCIADOS A ESTAS. ESTE ESTUDIO ESTA BASADO EN NUMEROSAS OBSERVACIONES ORIGINALES EN EL INFRARROJO Y EL OPTICO QUE INCLUYEN FOTOMETRIA, ESPECTROSCOPIA E

The variation of the electron density with position in a selected group of bright giant extragalactic H II regions has been studied using long slit spectrophotometry at high spectral and spatial resolution. Density values for the ionized gas of the regions have been obtained from the measurement of the forbidden S II 6717, 6731 A ratio. It is

CCD photometry of faint stars in the globular cluster M3 is presented. The observations reach down to V equal to about 23 mag, with a sample of approximately 5000 stars. The resulting color magnitude diagram has a turn-off significantly redder than those obtained in previous studies. Age and distance are derived by fitting the observed mean line to