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From 1975 to 1976, an outburst was detected in the light curve of the X-raytransient A0620-00 using the Ariel V and SAS-3 experiments. In this letter wemodel the outburst with the hydrodynamical model proposed by Mendoza et al.(2009). The physical model is constructed assumming basic mass and momentumconservation laws associated to the motion of the shock waves developed insidethe expanding relativistic jet of the source. These internal shock waves areproduced as a result of periodic variations of the inyected mass and velocityof the flow at the base of the jet. The observations of this X-ray light curvepresent two clear bumps. The first one is modelled assuming periodic variationsof the inyected velocity at the base of the jet, while the second one caneither be modelled by a further velocity oscillations, or by a periodicvariation of the mass injection rate at the base of the jet at a latter time.The fitting of the data fixes different parameters of the model, such as themean mass injection rate at the base of the jet and the oscillation frequencyof the flow as measured on the rest frame of the central source.

Hydrodynamics associated to the X-ray light curve of A0620-00