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A&A 483, 519-527 (2008)
DOI: 10.1051/0004-6361:200809380
Abundances in planetary nebulae: NGC 6826
R. Surendiranath1 and S. R. Pottasch21 Indian Institute of Astrophysics, Koramangala II Block, Bangalore 560034, India
e-mail: nath@iiap.res.in
2 Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
e-mail: pottasch@astro.rug.nl
(Received 10 January 2008 / Accepted 29 February 2008)
Abstract
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