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We present the results of the combined analysis of three XMM-Newton EPICobservations of the northern rim of the Vela SNR. The three pointings cover anarea of ~10 pc^2 (at 250 pc) behind the main shock front and we aim at studyingwith high resolution the spatial distribution of the physical and chemicalproperties of the X-ray emitting plasma on this large scale. We producecount-rate images and equivalent width maps of the Ne IX and Mg XI emissionblends. We also perform a spatially resolved spectral analysis of a set ofphysically homogeneous regions. We reveal physical and chemical inhomogeneitiesin the X-ray emitting plasma. In particular, we find large variations of the O,Ne, Mg, and Fe abundances. In some bright knots we also find unexpectedlyenhanced Ne and Mg abundances, with values significantly larger than solar. Ourresults support a possible association of a few X-ray emitting knots withpreviously undetected residuals of stellar fragments (i. e. shrapnels)observed, in projection, inside the Vela shell.

Physical and chemical inhomogeneities inside the Vela SNR shell. Indications of ejecta shrapnels