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Issue A&A
Volume 436, Number 3, June IV 2005
Page(s) 953 - 965
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20042627



A&A 436, 953-965 (2005)
DOI: 10.1051/0004-6361:20042627

Abundances of planetary nebulae NGC 2022 , NGC 6818 and IC 4191

S. R. Pottasch1, D. A. Beintema1, 2 and W. A. Feibelman3

1  Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
    e-mail: pottasch@astro.rug.nl
2  SRON Laboratory for Space Research, PO Box 800, 9700 AV Groningen, The Netherlands
3  Laboratory for Astronomy and Solar Physics, Code 681, Goddard Space Flight Center MD, USA

(Received 30 December 2004 / Accepted 11 March 2005)

Abstract
The ISO and IUE spectra of the elliptical nebulae are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebulae is then calculated and compared to previous determinations. A discussion is also given of the exciting stars of the nebulae, and possible evolutionary effects.


Key words: ISM: abundances -- ISM: planetary nebulae: individual: NGC 2022 -- ISM: planetary nebulae: individual: NGC 6818 -- ISM: planetary nebulae: individual: IC 4191

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