NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-25 T05:12:14 PDT
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For refcode 2000A&A...354..874P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2000A&A...354..874P The oxygen abundance deficiency in irregular galaxies. PILYUGIN L.S., FERRINI F. Received 29 October 1999/Accepted 13 December 1999 Abstract: The observed oxygen abundances in a number of irregular galaxies have been compared with predictions of the closed-box model of chemical and photometric evolution of galaxies. Oxygen is found to be deficient with respect to the predicted abundances. This is an indicator in favor of loss of heavy elements via galactic winds or/and of infall of low-abundance gas onto the galaxy. The oxygen abundance deficiency observed within the optical edge of a galaxy cannot be explained by mixing with the gas envelope observed outside the optical limit. We confirm the widespread idea that a significant part of the heavy elements is ejected by irregular galaxies in the intergalactic medium. Key words: galaxies: abundances - galaxies: evolution - galaxies: ISM - galaxies: irregular
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