The activity phase of BF Cygni discovered in May 1989 and which lasted about two years is examined. The UV emission lines, usually strong during quiescence, were not detectable during the outburst. UV high-resolution spectra in the outburst indicate the development of an expanding shell giving rise to a considerable number of violet-shifted

Results of a chemodynamical study of the W-R ring nebula NGC 6888 around the WN6 star WR 136 are presented; the observations combine high spatial and spectral resolution covering most of the optical range in different zones of the nebula. The spectra show an emission system with three different velocity components: -64 km/s, +78 km/s, and +18 km/s

The peculiar giant extragalactic HII region NGC 588 has been observed with the TAURUS Fabry-Perot Spectrograph at the William Hershell Telescope of the Observatorio del Roque de los Muchachos. Velocity maps at the seeing limit were obtained in the lines of Hα and [OIII]lambda 5007. We have studied the kinematics of the gas and its relation with the

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We study the photoionization of the Extended Narrow Line Region (ENLR) using three anisotropic radiation fields: (1) a geometrically thick accretion disk; (2) a large (at 1 pc to the nucleus) obscuring torus; (3) a blazar beam produced by a relativistic jet. The variation of the intensity of several emission lines with the inclination angle with

We have used the TAURUS Fabry-Perot imaging spectrograph at the William Hershell Telescope of the Observatorio del Roque de los Muchachos to study the kinematics of the HII regions in the central zone of the irregular galaxy NGC 4449. Velocity maps have been obtained in the lines of Hα and [OIII]lambda 5007. Those maps allow us to study the