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We present the results of new spectral diagnostic investigations applied tohigh-resolution long-slit spectra of the RW Aur bipolar jet obtained withHST/STIS. The spectra include the forbidden doublets [O I] 6300,6363 \AA, [SII] 6716,6731 \AA, and [N II] 6548, 6583 \AA that we utilized to determineelectron density, electron temperature, hydrogen ionisation fraction, totalhydrogen density, radial velocity and the mass outflow rate. We were able toextract the parameters as far as 3".9 in the red- and 2".1 in the blueshiftedbeam. The RW Aur jet appears to be the second densest outflow from a T Tauristar studied so far, but its other properties are quite similar to those foundin other jets from young stars. The overall trend of the physical parametersalong the first few arcseconds of the RW Aur jet is similar to that of HH 30and DG Tau and this can reflect analogies in the mechanisms operating in thatregion, suggesting the same engine is accelerating the jets in the T Tauristars with outflows. Our study of the RW Aur jet indicates for the first timethat, despite the detected marked asymmetries in physical and kinematicproperties between the two lobes, the mass outflow rates in the two lobes aresimilar. This appears to indicate that the central engine has constrainingsymmetries on both sides of the system, and that the observed asymmetries areprobably due to different environmental conditions.

HST/STIS observations of the RW Aurigae bipolar jet: mapping the physical parameters close to the source