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

Y. G. Tsamis, M. J. Barlow, X.-W. Liu, I. J. Danziger
2003 Symposium - International astronomical union  

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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-apertureIUE,
more » ... SOdata to yield integrated abundances for more than half of our target objects.
doi:10.1017/s007418090020911x fatcat:geygasauavh73gblhaxxohyslm
Citation

Y. G. Tsamis, M. J. Barlow, X.-W. Liu, I. J. Danziger. "A Survey of Recombination-line Abundances in Planetary Nebulae and H II Regions." Symposium - International astronomical union (2003) 383-384