The jets of SS 433: second order effects

Previous analyses of the X-ray emission from SS 433 have assumed conically out-flowing jets of hot plasma in ionizational equilibrium conditions to de duce the system's physical parameters from the data. Current X-ray instrume nts are sensitive enough to detect the effects of second order deviations f rom these simple assumptions in the measured spectra. We have modeled the t wo dimensional hydrodynamic outflow of the jets with different initial cond itions, and considered nonequilibrium effects and photoionization in the pl asma. The deviations from the canonical model are discussed and the influen ce on the determination of the system's physical parameters are evaluated.