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Date and Time of the Query: 2019-06-24 T18:19:14 PDT
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For refcode 1993MNRAS.265..199V:
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NED Abstract

Copyright by Royal Astronomical Society. 1993MNRAS.265..199V The nitrogen-to-oxygen ratio in galaxies, and its implications for the origin of nitrogen M. B. Vila-Costas and M. G. Edmunds Department of Physics and Astronomy, University of Wales College of Cardiff PO Box 913 Cardiff CF2 3YB Accepted 1993 May 17. Received 1993 April 22; in original form 1992 December 18 ABSTRACT We re-examine the available data on nitrogen and oxygen abundances deduced from the spectra of giant H II regions in external galaxies. If account is taken of the likely differences in temperature between the [O II] and [O III] ionization zones, the derived N/O ratios as a function of O/H can consistently be explained by models in which nitrogen has both a (delayed) primary and a secondary component relative to oxygen, with the secondary component dominating at high abundance. There is also some evidence that the secondary component is delayed (by perhaps 2 x 10^9^ yr), and that there is some spread in the ages of the discs of late-type spirals. Key words: galaxies: abundances - galaxies: evolution.
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