Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1421l&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #14.21; Bulletin of the American Astronomical Society, Vol. 34, p.1121
Astronomy and Astrophysics
Astronomy
1
Scientific paper
As part of an ongoing survey of dwarf galaxies within the Local Volume (< 5 Mpc), extensive photometric and spectroscopic observations are being conducted with the HST and ground-based telescopes. New optical spectroscopic data have been obtained of H II regions in 17 southern dwarf irregular galaxies, including those in the Centaurus A group, the Sculptor group, the Local Group, and the field. A majority of the dwarfs are metal-poor with oxygen abundances, 12+log(O/H), in the range between 7.4 and 8.0 (approximately 5% to 20% of solar). ESO358-G060 has an oxygen abundance comparable to that of the second most metal-poor dwarf galaxy known (SBS0335-052). Oxygen abundances for dwarfs in the present sample are consistent with the metallicity-luminosity relationship defined by nearby dwarf irregulars. However, upon comparison with the nearby sample, a number of objects in the present sample have lower M{H I}/LB values at a given abundance and luminosity. These objects may be in fact gas-poor, have strong bursts whose luminosities are biasing M{H I}/LB, and/or are evolving as ``closed boxes'' with oxygen yields one-tenth of the solar value.
Grebel Eva Katharina
Hodge Paul W.
Lee Hyunyoung
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