The chemical abundances in a sample of dwarf irregular galaxies. I. Small scale variations within NGC 6822?

Details The chemical abundances in a sample of dwarf irregular galaxies. I. Small scale variations within NGC 6822? The chemical abundances in a sample of dwarf irregular galaxies. I. Small scale variations within NGC 6822?

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..388h&link_type=abstract

Astronomy and Astrophysics, v.367, p.388-404 (2001)

Astronomy and Astrophysics

Astrophysics

13

Galaxies: Evolution, Galaxies: Irregular, Galaxies: Stellar Content, Ism: H Ii Regions

Scientific paper

Deep groundbased spectra of Hubble V and Hubble X, the two largest and ightest H ii regions in the Local Group dwarf galaxy, NGC 6822, are presented. The extinction, excitation and ionization are studied on scales as small as 4 pc. The chemical composition of some elements within the regions as well as possible small scale variations in the abundances of helium, nitrogen, oxygen and neon over the face of the two regions are investigated. The detection of the emission lines lbrack OIrbrack and lbrack ClIIIrbrack are probably related to shock-heating from gas ejected from supernova explosions and planetary nebula ejections, respectively, although the contribution to the total ionization is very small. No significant differences in chemical composition was found between Hubble V and Hubble X. However, some small scale variations in the abundances of oxygen, and possibly nitrogen and helium, over the face of both H ii regions were noted, although different physical conditions could apply within the regions, such as local fluctuations in the temperature. Based on observations made at the European Southern Observatory, La Silla, Chile. Figures 2 and 5 are only available in electronic form at http://www.edpsciences.org

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