Abundances in dwarf irregular galaxies.
Abstract
The results of abundance studies of dwarf irregular galaxies and similar objects are reviewed with special attention to variations in the CNO element group. Observations of the forbidden N II and semiforbidden C III lines in the most metal-poor galaxy known, IZw 18, are presented for the first time and CNO abundances are derived via a photoionization model and discussed in the context of the abundances found in other metal-poor H II regions and galaxies.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- October 1986
- DOI:
- 10.1086/131867
- Bibcode:
- 1986PASP...98.1025D
- Keywords:
-
- Abundance;
- Astronomical Spectroscopy;
- Dwarf Galaxies;
- Irregular Galaxies;
- Nebulae;
- Carbon;
- H Ii Regions;
- Metallicity;
- Nitrogen;
- Oxygen;
- Astrophysics;
- Dwarf Galaxies:CNO;
- Dwarf Galaxies:Element Abundances;
- Dwarf Galaxies:H II Regions;
- H II Regions:Dwarf Galaxies