A detector test bench is described which encompasses among its capabilities a wide, IR-visible spectral range, and a wide range of radiation response. The optical, cryogenic, mechanical and electronic devices used are sufficiently flexible for data acquisition that characterizes the detector in terms of linearity, dark noise, spectral and time

We report the results of a systematic study on the spatial variation of the electron density in a selected group of bright giant H II complexes in the galaxies M 101, M 51, and NGC 6822. Density values for the ionized gas of the regions have been obtained from the forbidden S II 6717/6731 ratio, using long-slit spectrophotometry at high spectral

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Near infrared monitoring taken with the 1.5 m Carlos Sanchez Telescope in Tenerife of the decline of 3C279 during its 1988 outburst is presented. These data are combined with visible monitoring and data from the literature to examine the behavior of the light curve from B to K. A maximum in the infrared light curve was observed in June 1989 which