Abundances of Planetary Nebulae BD+30 3639 and NGC 6543^*

¹ SRON National Institute for Space Research, PO Box 800, 9700 AV Groningen, The Netherlands
² Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
³ Laboratory for Astronomy and Solar Physics, NASA-Goddard Space Flight Center, Greenbelt, MA 20771, USA

Corresponding author: J. Bernard-Salas, J.Bernard@sron.rug.nl

Received: 28 February 2003
Accepted: 15 May 2003

Abstract

Infrared spectra taken with the Short Wavelength Spectrometer on board ISO and UV observations with IUE of planetary nebulae BD+30 3639 and NGC 6543 are presented. The extinction derived using infrared lines for BD+30 3639 is , slightly higher than previous determinations. For NGC 6543 the extinction found from the hydrogen lines is . Infrared, optical and ultraviolet data have been used to derive the physical parameters of the nebula. BD+30 3639 has an average K and . In the case of NGC 6543 a K and have been found, in agreement with previous determinations. The element abundances have been derived and compared to those found in the Sun and O, B stars. This comparison gives a hint of the mass of the progenitor stars from which they evolved.