EL OBJETIVO DE LA MEMORIA PRESENTADA POR ALEJANDRO OSCOZ ES EL ESTUDIO DE LA PROPAGACION DE LA LUZ EN PRESENCIA DE LA GRAVEDAD. EN PRIMER LUGAR SE HACE UN ANALISIS DETALLADO DE LA INFLUENCIA DE LA CURVATURA DE LOS RAYOS DE LUZ EN LOS CALCULOS DEL RETRASO DE LAS SEÑALES DEL RADAR EN EL SISTEMA SOLAR, TANTO DESDE EL PUNTO DE VISTA HABITUAL

We study deformations of the standard embedding of the Lie algebra $Vect(S^1)$ of smooth vector fields on the circle, into the Lie algebra of functions on the cotangent bundle $T^*S^1$ (with respect to the Poisson bracket). We consider two analogous but different problems: (a) formal deformations of the standard embedding of $Vect(S^1)$ into the

We present the results of applying a new chemo-evolutionary stellar population model, developed in a previous paper, to new high-quality observational data of the nuclear regions of two representative elliptical galaxies and the bulge of the Sombrero galaxy. Here we fit in detail ~20 absorption lines and six optical and near-infrared colors

We present new BV photometry for 6564 stars in the field of the globular cluster NGC 6366, using a wide field CCD camera at the prime focus of the Isaac Newton Telescope (INT 2.5m). The mean internal accuracy of the present V magnitudes and (B-V) colours ranges from 0.005mag for the stars at the top of the Red Giant Branch to 0.07mag for the

We have obtained near-infrared observations of some of the faintest objects so far known towards the Pleiades young stellar cluster, with the purpose of investigating the sequence that connects cluster very low-mass stars with substellar objects. We find that infrared data combined with optical magnitudes are a useful tool to discriminate cluster

We present a new, fast and easy to use NLTE line formation code for ``unified atmospheres'' with spherical extension and stellar winds, developed for the (routine) spectroscopic analysis of luminous blue stars, covering the spectral range from ``A'' to ``O'' and including central stars of planetary nebulae. The major features of our code are: Data