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Paper: Abundance Profile and Stellar Content of I ZW 18
Volume: 147, Abundance Profiles: Diagnostic Tools for Galaxy History
Page: 116
Authors: Legrand, Francois
Abstract: New observations of the metal poor galaxy I Zw 18 are discussed. Wolf-Rayet stars of WC type have been detected in the NW-H ii 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 H ii region. This emphasizes the problem of the dispersal and mixing of newly synthesized elements 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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