Gravitational lenses are a consequence of the bending of light rays, which is one of the "classical" tests of Einsteins' General Relativity. This phenomenon appears when a large amount of mass, one or several galaxies, is located near the line-of-sight connecting the observer with a remote bright source, a quasar, far-off from both objects. In this

We included 2 tables containing photometric data, together equivalent width of LiI6708 A, for a sample of dwarf components of Chromospherically Active Binaries (CABs). (3 data files).

Background information is presented on the T Tauri stars observed with the IUE until the end of 1994. The log of observations and the UV spectrum are provided for all the objects as well as the FES light curves until November 1992. This information is completed with basic data on the individual sources.

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We present new effective temperature and surface gravity determinations for a sample of 90 hot white dwarfs detected in the Extreme Ultraviolet Explorer (EUVE) all-sky survey. The measurements, based on spectroscopy of the Balmer line series obtained at the Michigan-Dartmouth-MIT Observatory, Mount Stromlo Observatory, Lick Observatory, and Cerro

Three planetary nebulae in the Large Magellanic Cloud (LMC) were observed with the Faint Object Spectrograph on board the Hubble Space Telescope. Their central stars display P Cygni--like features in the ultraviolet. We modeled these profiles to derive the stellar wind velocities. The wind velocities of the LMC planetary nebula nuclei (PNNs) are