LA PRESENTE TESIS REPRESENTA UN IMPORTANTE AVANCE DENTRO DEL DIFICIL PROBLEMA DE EVITAR/CORREGIR, EN LA MAYOR MEDIDA POSIBLE LAS DISTORSIONES QUE INTRODUCE LA ATMOSFERA EN IMAGENES OBSERVADAS A TRAVES DE TELESCOPIOS. EL ESTUDIO ES COMPLETO. COMIENZA CON EL ANALISIS DE LA IDONEIDAD DE DETERMINADOS DETECTORES ESPECIALES ASEQUIBLES HOY EN DIA

The propagation of a shock wave in a magnetic flux tube is studied within the framework of the Brinkley-Kirkwood theory adapted to a radiating gas. Simplified thermodynamic paths along which the compressed plasma returns to its initial state are considered. It is assumed that the undisturbed medium is uniform and that the flux tube is optically

This project presents the principal conclusions of a long series of infrared and visible observations of blazars taken from 1987-92. The data fall broadly into three classes: spectropolarimetry in the range 4000-9500A of a small sample of selected AGNs; polarimetry of a sample of a dozen blazars and some twenty low polarisation quasars (LPQs)

We report the results of a multisite observing campaign of observations of OJ287 in the visible, near infrared and submillimetric in Winter 1989-90. Simultaneous UBVRIK and white light data were obtained with three telescopes in Tenerife and La Palma on three nights in December-January, supported by follow-up observations in January and March 1990

EL OBJETIVO DE ESTA TESIS ES EL ESTUDIO DE LA FUENTE DE RAYOS X V404 CYGNI. EN ELLA SE PRESENTA UNA IMPORTANTE BASE DE DATOS, PRINCIPALMENTE ESPECTROSCOPIA DE ALTA RESOLUCION EN EL RANGO OPTICO, QUE ES LA MAS COMPLETA DE QUE SE DISPONE EN LA ACTUALIDAD. A PARTIR DE ESTOS DATOS OBSERVACIONALES SE HA ESTUDIADO EL SISTEMA, ANALIZANDO SU GEOMETRIA Y

Full solar disk observations of radial velocity, obtained with the IRIS network of resonant scattering spectrometers, are used to analyze the acoustic p-mode spectrum around the acoustic cut-off frequency. Three different methods are used to determine it; two use the power spectrum, while the third uses the phase spectrum. The three values measured