A MODEL OF THE PLANETARY-NEBULA NGC-2440

A 2-dimensional cylindrically symmetric ionisation model of the planet ary nebula NGC 2440 is presented. The grid-size with which the model h as been calculated has been adapted to match the spatial resolution of monochromatic CCD-images obtained in several emission lines. The comp arison between ''real'' images and ''model'' images yields an accurate simulation of the ionisation structure. From our models we also deter mined a consistent set of physical quantities of NGC 2440. Our resulti ng distance is 500 pc, the central star temperature and luminosity are 125 000 K and 250 L. respectively.