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Date and Time of the Query: 2019-08-23 T22:04:30 PDT
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For refcode 1992ApJ...390L..73Z:
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Copyright by American Astronomical Society. Reproduced by permission
1992ApJ...390L..73Z THE RADIAL DISTRIBUTION OF OXYGEN IN DISK GALAXIES DENNIS ZARITSKY Steward Observatory, University of Arizona, Tucson, AZ 85721; and The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 Received 1992 January 25; accepted 1992 February 27 ABSTRACT The shape of the oxygen abundance profile is examined for seven nearby spiral galaxies in which at least 15 H II regions have been observed. The radial abundance profile for three of these galaxies has a distinct change in slope. The others show no deviation from a single scale-length exponential. This behavior is explained within the framework of the star- forming viscous disk model of galaxy evolution. A prediction is made that radial abundance profiles of noninteracting unbarred spiral galaxies change slope at the radius where the rotation curve changes from linearly rising to flat. For barred and interacting galaxies the situation is complicated by additional mixing mechanisms of the interstellar medium. Subject headings: galaxies: abundances - galaxies: evolution - H II regions
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