Abundance profile and stellar content of IZw18

Details Abundance profile and stellar content of IZw18 Abundance profile and stellar content of IZw18

1997-12-08

arxiv.org/abs/astro-ph/9712113v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 postscript figures, To appear in "Abundance Profiles: Diagnostic Tools for Galaxy History" proceedings from worksho

Scientific paper

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.

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