We apply the spherical infall model to compare the observed distribution of radial velocities of galaxies around Coma with predictions that are based on optical and X-ray overdensity profiles. Two optically selected galaxy catalogues, the CfA redshift survey and a UKST plate scanned with the APM, are used to determine the overdensity profile of the

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EL OBJETIVO DE ESTA TESIS HA SIDO EL ESTUDIO DE REGIONES EXTENSAS DE LINEAS DE EMISION ESTRECHAS (RELE) ASOCIADAS A GALAXIAS ACTIVAS, CON EL FIN DE DETERMINAR EL DIAGRAMA POLAR DEL CONTINUO IONIZANTE NUCLEAR Y CON ELLO RESTRINGIR LOS PARAMETROS DE LOS MODELOS DE LA FUENTE DE DICHO CONTINUO. PARA ELLO SE HAN COMBINADO OBSERVACIONES CON

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The equivalent widths and abundances of Lithium in galactic carbon stars are presented in Table 1. The observations were made during 1990 and 1991 in 3 different observatories: Roque de los Muchachos and Calar Alto (Spain), and La Silla (Chile). The resolving power of the spectra is 15000-2000 for the spanish observations, and about 60000 for the

We have obtained ROSAT PSPC observations of N44, one of the largest H II complexes in the Large Magellanic Cloud. The X-ray emission mostly fails within the ionized shell structures in N44. We find that one faint shell is a classical supernova remnant overlooked by previous surveys. If we model the two largest shells as pressure-driven superbubbles