Panel a) deconvolved PACS image at 70 μm. The arrow indicates the space motion and the position in 500 yrs; b) is the same for the 160 μm band and c) is the 70 μm deconvolved PACS image with contours and arcs labelled as A, B, C, D and E. The lowest contour is the 3σ threshold (and is depicted in white), the arrow labelled with Vspace shows the direction of the space motion, the bar labelled PA orbit gives the orientation of the major axis of the apparent orbit, orthogonal to the node line. Panel d) results from the “toy model” described in Sect. 3.3 that is based on the hydrodynamical simulations of Mohamed & Podsiadlowski (2007, 2011).
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