Abundances in planetary nebulae: NGC 6826*
Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560034, India e-mail: firstname.lastname@example.org
2 Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands e-mail: email@example.com
Accepted: 29 February 2008
Aims. We determine the chemical abundances and other parameters of the nebula NGC 6826 and its central star.
Methods. We present new ISO spectra and combine them with archival IUE and optical spectra from the literature to get a complete, extinction-corrected, spectrum. The chemical composition of the nebula is then calculated in two ways, first by directly calculating and adding individual ion abundances, and second by building a model nebula that will reproduce the observed spectrum.
Results. The results of these two methods are compared. In addition, we discuss the star exciting the nebula.
Key words: ISM: abundances / ISM: planetary nebulae: individual: NGC 6826 / infrared: ISM
© ESO, 2008