Despite the discovery of the cosmic-rays dates back more than one century, their origin is still debated, as well as the contribution arising from our Galaxy. On my work I studied Galactic sources capable of accelerating cosmic-rays above TeV energies, and I analysed in details the emission of some pulsars, pulsar wind nebulae and gamma-ray binaries. I published the first paper reporting on the discovery of the GeV flares of the Crab nebula, i.e. the detection of the highest energy electrons ever observed, and on the difficulties in explaining synchrotron emission at PeV energies. I also presented a detailed analysis of the variability of Eta Carinae observed by Fermi LAT and its comparison with hydrodynamical simulations for different emission models, concluding that hadronic acceleration is likely to happen in this source, possibly accelerating particles to energies higher than those reached in supernova remnant shocks.