The geometry of the system

From the shape of the planetary nebula in a high-resolution CCD-image Pollaco & Bell ([1997]) deduce an orbital inclination of 66^o for the central binary system. This holds true under the assumption that an elliptical structure seen close to the centre of the nebula is in fact circular and inclined to the line of sight, and if it has been ejected in the orbital plane. Comparing this to the results or our model calculations we find disagreement with Model 1 (i=42.5^o for Model 1.1 and i=48.8^o for Model 1.2), whereas the agreement with Model 2 (Model 2.1: i=67.1^o; Model 2.2.1: i=65.7^o; Model 2.2.2: i=67.2^o) is almost perfect.