Inversion techniques are the most powerful methods to obtain information about the thermodynamical and magnetic properties of solar and stellar atmospheres. In the last years, we have witnessed the development of highly sophisticated inversion codes that are now widely applied to spectro-polarimetric observations. However, no realistic confidence

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The alignment generated in the ground level of Fe X by scattering in the coronal red line λ6374, can be efficiently transferred by collisions to upper levels; the ensuing spontaneous emission in allowed EUV transitions (as 174.5~Å and 177~Å) is then linearly polarized. The polarization thus generated would be sensitive to the electronic density (Ne

We devised a new method to estimate globular cluster absolute ages by adopting the knee of the bending of the lower main-sequence (MS) in the Near-Infrared (NIR) J, J - Ks color-magnitude diagram. The color difference between this feature and the Turn-Off point is strongly correlated to the cluster age. This method is marginally affected by

Esta tesis versa sobre la distribuci¢ión espacial de la Formación Estelar (FE) en galaxias. Este campo de estudio es bastante amplio, ya que la morfología de la FE enlaza con temas tan diversos como los mecanismos de disparo y regulación de la formación estelar, la propagación de ondas espirales en discos estelares, o la estructura de densidades de

Starting from a sample of type-2 AGN, the effect of the large-scale environmental density (LSED, parametrized by the surface density) on the mass of central black holes (MBH) and SFR in AGN is studied. We find there is not apparent dependence between the environment and these variables. The invariance LSED-MBH suggests that there are not traces in