Preliminary results of a program aimed at investigating the presence of H II regions around Seyfert nuclei are presented. Extended zones of ionized gas have been detected around some classical Seyfert galaxies. It is thought that the ionizing mechanism in these extended regions is UV radiation from young stars formed in a recent burst of star

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Topics discussed in this symposium are on the Galaxy, the Magellanic Clouds, elliptical galaxies, the structure of spirals and galaxy interactions, and the gas and star formation in galaxies. Papers are presented on the Galactic evolution and the star counts in the Galaxy, the physical parameters of reflection nebulae in the Galaxy, chemical

A measurement of the absolute flux from Vega at wavelength of 2.250 microns by comparison with a standard source is presented. The result is 3.86 10 to the -10 W/sq m micron, with a probable error of 4 percent, in fair agreement with other determinations made by this method.

Current observational constraints on anisotropies in the cosmic microwave background (CMB) and on the clustering of galaxies have considerably narrowed the range of acceptable models for galaxy formation. Observations of these anisotropies on intermediate and large angular scales provide the best constraint on the amplitude of very long wavelength

Highly ionized large scale structures have recently been observed in many active galaxies. There is evidence that photoionization by the active nucleus may be the most relevant mechanism, responsible of the excitation of the gas. The authors use a simple model for a thick accretion disk around a supermassive black hole and a photoionization code to