The galaxy NGC 5506 hosts an active nucleus, that presents characteristics that are intermediate between Sy1 and Sy2. We discuss long slit spectra of NGC 5506 in the ranges 4675-5475 A and 6300-7125 A, that were obtained at three different position angles, in Apr. 1991 at the WHT 4.2 m telescope. The peculiar kinematics of the emitting gas has

The onset of forbidden line emission in the spectrum of a proto-planetary nebula has been detected for the first time in the lapse of only two years. IRAS 06562-0337 was first observed in December 1987 and October 1988, showing only the Balmer lines in emission. A third spectrum obtained in February 1990 shows a quite different appearance, with

EL OBJETIVO DE ESTA TESIS ES EL ESTUDIO DE LOS CUATRO OBJETOS TIPO AM CVN CONOCIDOS (AM CVN, GP COM, CR BOO Y V803 CEN). EN LA MEMORIA SE INCLUYE UNA EXTENSA REVISION DE LA BIBLIOGRAFIA RELEVANTE, QUE MUESTRA LA NECESIDAD DE REALIZAR NUEVAS OBSERVACIONES Y COORDINAR EL ESTUDIO EN DIFERENTES LONGITUDES DE ONDA, PARA DAR RESPUESTA A LOS INTERROGANTES

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