Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20311509l&link_type=abstract
American Astronomical Society Meeting 203, #115.09; Bulletin of the American Astronomical Society, Vol. 35, p.1393
Astronomy and Astrophysics
Astronomy
1
Scientific paper
NGC 6822 is a nearby dwarf irregular galaxy (D ≈ 0.5 Mpc) within the Local Group, whose stellar content has been well-studied. Recent work on the abundances of individual supergiant stars in this galaxy in combination with published H II region abundances suggested the existence of a radial abundance gradient, seen more typically in spiral galaxies (Venn et al. 2001). We present new optical spectroscopy of twelve H II regions in NGC 6822 obtained with EFOSC2 at ESO. With our available spectra and a reexamination of the literature, we investigate the following: (1) possible discrepancies in nebular abundances, (2) the presence of an abundance gradient, (3) a comparison of stellar and H II region abundances, and (4) whether there is any dispersion in abundances at a given radius.
H.L. and E.D.S. acknowledge partial support from a NASA LTSARP grant NAG 5--9221 and the University of Minnesota. K.A.V. would like to thank the National Science Foundation for support through a CAREER award AST 99--84073.
Lee Hyunyoung
Skillman Evan D.
Venn Kim A.
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