SRON Laboratory for Space Research, PO Box 800, 9700 AV Groningen, The Netherlands
2 Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
Corresponding author: J. Bernard Salas, J.Bernard@sron.rug.nl
Accepted: 27 November 2000
We present the infrared spectrum of the planetary nebula NGC 7027 observed with the Short Wavelength Spectrometer (SWS), on board the Infrared Space Observatory (ISO). These data allow us to derive the electron density and, together with the IUE and optical spectra, the electron temperature for several ions. The nebular composition has been determined, the evolutionary status of the central star is discussed and the element depletion in the nebula is given. We conclude that the progenitor was a C-rich star with a mass between 3 and 4 .
Key words: ISM: abundances / planetary nebulae: individual: NGC 7027 / infrared: ISM: lines and bands
© ESO, 2001