The Nitrogen-To Ratio in Galaxies and its Implications for the Origin of Nitrogen

Details The Nitrogen-To Ratio in Galaxies and its Implications for the Origin of Nitrogen The Nitrogen-To Ratio in Galaxies and its Implications for the Origin of Nitrogen

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.265..199v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 265, NO. 1/NOV1, P. 199, 1993

Astronomy and Astrophysics

Astronomy

137

Scientific paper

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.

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