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The BL Lac object OJ287 has been studied with the 4.2m William Herschel Telescope (WHT) from the Spanish Observatory of La Palma on six nights in December 1993 and January 1994, as part of the OJ-94 International Campaign of monitoring of OJ287. At the time of the first observations, in mid-December the object was in the decline phase of a moderate

We present visible and near infrared observations of the blazar OJ287 taken during a flare of nearly two magnitudes amplitude in V, which peaked on December 6th 1993 at V=14.5 (Kidger et al., 1993, IAUC 5909). Simultaneous visible (BVRI) and near infrared (JHK) photometry were taken on two nights during the decline phase of this outburst. The

EN ESTA TESIS SE ESTUDIAN LA DEPENDENCIA DE LA RADIACION GRAVITATORIA GENERADA POR SISTEMAS BINARIOS EN LA EXCENTRICIDAD DE LA ORBITA. ESTE OBJETIVO SE HA CONSEGUIDO MEDIANTE EL USO DE ALGUNAS APROXIMACIONES BASTANTE PRECISAS QUE PERMITEN LA OBTENCION DE RESULTADOS ANALITICOS RELATIVAMENTE SENCILLOS. LAS APROXIMACIONES REALIZADAS SON DE DOS TIPOS

From low and high resolution spectroscopic observations of IRAS 10215-5916 we have discovered the presence of nebular emission lines in this G-type supergiant star in the post-AGB stage. From its high resolution spectrum we derived an expansion velocity of 17 km/s for the shell, similar to the values usually observed in planetary and proto

We report on the Lovers of Active Galaxies' (LAG) monitoring of the Seyfert 1 galaxy Markarian 279 from January to June 1990. The source, which was in a very bright state, gradually weakened after the first month of monitoring: the Hα and Hβ flux decreased by 20% and 35% respectively, and the continuum under Hα by 30%. The luminosity-weighted