Abundance profile and stellar content of IZw18
Abstract
New spectroscopic observations of the metal poor galaxy IZw 18 are discussed. Wolf-Rayet stars of WC type have been detected in the NW-HII region contrary to evolutionary synthesis model predictions. Implications on the mass loss rate and on the formation processes of WR stars are discussed. A very homogeneous metal abundance is observed within the HII region. This emphasizes the problem of the dispersal and mixing of new synthesized element in a starburst. Different scenarios are discussed, showing that metals remain most likely hidden in a hot phase and that the observed present metallicity is the result of a previous star formation event.
Keywords
Cite
@article{arxiv.astro-ph/9712113,
title = {Abundance profile and stellar content of IZw18},
author = {F. Legrand},
journal= {arXiv preprint arXiv:astro-ph/9712113},
year = {2007}
}
Comments
4 pages, 2 postscript figures, To appear in "Abundance Profiles: Diagnostic Tools for Galaxy History" proceedings from workshop at U. Laval, October 1997