The main goal of this Thesis is to study the formation of the elements heavier than Fe in asymptotic giant branch (AGB) stars. These elements are formed when iron peak nuclei present in the intershell experience a series of slow neutron-captures and β− decays to form isotopes of heavier elements (the slow neutron-capture process, hereafter s

Las manchas solares, regiones oscuras y frías de la superficie solar, se llevan observando desde hace miles de años. Estas estructuras son grandes concentraciones de campo magnético que inhiben la convección, haciéndolas más frías y oscuras que sus alrededores (Hale 1908). Nos encontramos en un momento especialmente óptimo para el estudio en largas

The Canary Islands (Spain) host two of the best considered astronomical observatories in the World, Teide Observatory (OT), on the island of Tenerife, and Roque de los Muchachos Observatory (ORM), on the island of La Palma. A crucial parameter to carry out astronomical observations in the infrared (IR) and microwave ($\mu$W) bands, is the content

In spite of the instrumental improvements to acquire data and the new techniques developed to analysed them, the solar corona is one of the regions of the Sun with more unresolved questions. New methods to compare between observations and theoretical or numerical models are necessary to reveal the main physical conditions and processes of this

In the last decade the detection of new planets around stars outside our solar system has grown dramatically. These detections, made both from ground-based telescopes and from the different space missions dedicated to this type of discovery, have resulted in a large range of planets with different masses and radii. These values of masses and radii

Esta tesis presenta el análisis de dos galaxias esferoidales de la Vía Láctea (VL): Sextans y Sculptor. La metodología seguida en ambos los casos es la misma y ha dado lugar a resultados científicos notables que se han publicado en revistas científicas arbitradas. El ingrediente básico para este análisis está dado por la historia de formación