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We study the electron-proton temperature equilibration behind several shocksof the RCW 86 supernova remnant. To measure the proton temperature, we usepublished and new optical spectra, all from different locations on the remnant.For each location, we determine the electron temperature from X-ray spectra,and correct for temperature equilibration between the shock front and thelocation of the X-ray spectrum. We confirm the result of previous studies thatthe electron and proton temperatures behind shock fronts are consistent withequilibration for slow shocks and deviate for faster shocks. However, we cannot confirm the previously reported trend of the electron temperature to protontemperature ratio of 1/v^2.

Temperature Equilibration Behind the Shock Front: an Optical and X-ray Study of RCW 86