X-ray binary systems: A cauldron of physical processes

Galactic X-ray emitters have been described by Giovannelli and Sabau-Grazia ti (1993). We would address the bulk of this paper on High Mass X-Ray Binar ies (HMXBs) and particularly in demonstrating the importance of these syste ms as powerful laboratories to test the properties of high-energy physical processes through the multi-frequency studies of their behavior. Interactio ns between the two components of those systems originate processes that man ifest themselves along a large part of the electromagnetic spectrum. Theref ore it is possible to study indirectly high-energy phenomena through the an alysis of low-energy phenomena with enormous advantages since the latter ca n be mainly studied via ground-based experiments, meanwhile the former can be studied only by mean of space-based experiments, at least up to energies of order 100 GeV. Moreover, since HMXBs are galactic, their emissions are the highest measurable; this renders such systems the most powerful laborat ories to test theories on collapsed objects, which can be scaled to extra-g alactic distances and dimensions. This fact suggests that HMXBs can be in g eneral useful targets even for small satellites, and in particular, in the X-ray energy range, very suitable targets for experiments like SIXE (Spanis h Italian X-ray Experiment) to be launched in small satellites such as the Spanish MINISAT-02.