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A Survey of Recombination-line Abundances in Planetary Nebulae and H II Regions

Published online by Cambridge University Press:  26 May 2016

Y. G. Tsamis ,
M. J. Barlow ,
X.-W. Liu  and
I. J. Danziger
Y. G. Tsamis
Affiliation:
1 Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, U.K.
M. J. Barlow
Affiliation:
1 Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, U.K.
X.-W. Liu
Affiliation:
1 Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, U.K.
I. J. Danziger
Affiliation:
2 Osservatorio Astronomico di Trieste, Italy

Extract

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We have derived C, N and O abundances, relative to H, using optical recombination lines (ORLs), for a number of galactic planetary nebulae and for three Magellanic Cloud PNe (LMC N66, N141, SMC N87) and compared them with the corresponding abundances derived from collisionally-excited lines (CELs). Our goal was to investigate the fact that PNe ORL abundances are in most cases larger than those obtained from CELs. Our scanning, long-slit observations were combined with large-aperture IUE, IRAS and ISO data to yield integrated abundances for more than half of our target objects.

Type
Part VI: The Ionized Gas in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 383 - 384
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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