N/O in spiral discs: a new algorithm for abundance determinations

Details N/O in spiral discs: a new algorithm for abundance determinations N/O in spiral discs: a new algorithm for abundance determinations

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283..990t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, pp. 990-1002.

Astronomy and Astrophysics

Astronomy

42

Hii Regions, Galaxies: Abundances, Galaxies: Spiral

Scientific paper

We obtain nitrogen abundances in the HII 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 [NII], [OII] and [OIII] lines. We show the self-consistency of the new method, and also the agreement with more detailed modelling of individual HII regions. Gradients in [N/O] against effective radius and [O/H] are presented for a well-observed subset of galaxies from the Vila-Costas & Edmunds sample.

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