N/O in Spiral Disks: an Algorithm for Abundance Determinations

Details N/O in Spiral Disks: an Algorithm for Abundance Determinations N/O in Spiral Disks: an Algorithm for Abundance Determinations

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18710801t&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #108.01; Bulletin of the American Astronomical Society, Vol. 27, p.1439

Astronomy and Astrophysics

Astronomy

Scientific paper

We obtain nitrogen abundances in the H 2 regions of selected spiral galaxies by using a new algorithm developed from grids of photoionization models. The new method requires only the observation of optical [N 2], [O 2], and [O 3] lines. We show the self-consistency of the new method, and also the agreement with more detailed modeling of individual H 2 regions. Gradients in [N/O] against effective radius are presented for a well-observed subset of galaxies from a Vila-Costas and Edmunds sample (\cite{ve93}).

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