The main goal of this work is the analysis of new approaches in order to study the properties of astronomical sites. The objective is to calibrate the atmospheric extinction provided by in situ techniques through remote sensing data retrieved from satellite-platforms. We have selected data provided by different spectrographs on board NASA and ESA

The in-flight performance of the total and spectral irradiance instruments within VIRGO (Variability of solar IRradiance and Gravity Oscillations) on the ESA/NASA Mission SOHO (SOlar and Heliospheric Observatory) is in most aspects better than expected. The behaviour during the first year of operation of the two types of radiometers and the

We have made a series of hydrodynamic calculations of core collapsing models to examine the effects of temperature dependence of nuclear compressibility. With this aim we have focused on the influence of the equation of state derived by Viñas et al. for two extreme types of nuclear interactions. A Multigroup Trapping Scheme for neutrino transport

Research was carried out on the effect of considering two extreme kinds of Skyrme-type nuclear interactions on the outcome of stellar core collapsing models. Particular attention was given to dissociation effects generated by the shock. Neutrinos transport is included via a multigroup trapping scheme.

Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powered to a rotation-powered pulsar takes place on evolutionary timescales at the end of the accretion process, however it may also occur sporadically in systems undergoing

Millisecond radio pulsars are neutron stars that have been spun up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powered pulsar to a rotation-powered pulsar takes place on evolutionary timescales at the end of the accretion process; however, it may also occur sporadically in systems