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Abundance profile and stellar content of IZw18
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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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Cited by 1 Pith paper
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The Interstellar Medium in I Zw 18 seen with JWST/MIRI: III. Spatially Resolved Three Ionization State Oxygen Abundance
Spatially resolved direct-method oxygen abundances in I Zw 18 reveal 60 pc-scale chemical inhomogeneities and an oxygen ionization correction factor that underestimates O3+/H+ by ~2.
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