Journal
ASTROPHYSICAL JOURNAL
Volume 634, Issue 2, Pages 1056-1066Publisher
IOP PUBLISHING LTD
DOI: 10.1086/444557
Keywords
galaxies : abundances; galaxies : individual ( NGC 6822); H (II) regions
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We present long-slit spectrophotometry of regions Vand X of the Local Group irregular galaxy NGC 6822. The data consist of VLT FORS observations in the 3450 - 7500 angstrom range. We have obtained electron temperatures and densities using different line intensity ratios. We have derived the He, C, and O abundances relative to H based on recombination lines; the abundance ratios among these elements are almost independent of the temperature structure of the nebulae. We have also determined the N, O, Ne, S, Cl, and Ar abundances based on collisionally excited lines; the ratios of these abundances relative to that of H depend strongly on the temperature structure of the nebulae. The chemical composition of NGC 6822 V is compared with those of the Sun, the Orion Nebula, NGC 346 in the SMC, and 30 Doradus in the LMC. The value of O/H derived from recombination lines is in good agreement with that derived by Venn and coworkers from two A-type supergiants in NGC 6822.
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