Far-infrared measurements of N/O in H II regions - Evidence for enhanced CN process nucleosynthesis in the inner Galaxy

Details Far-infrared measurements of N/O in H II regions - Evidence for enhanced CN process nucleosynthesis in the inner Galaxy Far-infrared measurements of N/O in H II regions - Evidence for enhanced CN process nucleosynthesis in the inner Galaxy

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..573l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 15, 1987, p. 573-585. Research supported by the Robert A. Welch

Astronomy and Astrophysics

Astrophysics

69

Abundance, Far Infrared Radiation, H Ii Regions, Infrared Spectra, Milky Way Galaxy, Nitrogen, Nuclear Fusion, Carbon, Electron Density (Concentration), Fine Structure, Forbidden Transitions, Oxygen

Scientific paper

Measurements of the [N III] 57.3 μm, [O III] 51.8 μm, and 88.4 μm fine-structure emission lines, obtained with the KAO, are presented for 13 Galactic H II regions spanning a large range in galactocentric distance, and also for two H II regions in the 30 Doradus complex of the LMC. Using newly revised atomic constants, N++/O++ ionic ratios are derived for each of these nebulae. The authors argue that this ratio is proportional to the elemental ratio N/O, and its differences around the Galaxy reflect differences in nucleosynthetic history. It is found that N/O varies significantly with galactocentric distance. H II regions inside 7 kpc have N/O that is, on the average, a factor of 3 to 4 higher than those at larger radii. Comparison of the inferred N/O with O/H gives evidence for secondary enrichment of nitrogen in the heavily processed regions of the inner Galaxy. This is expected for nitrogen production by quiescent CN processing in stellar envelopes.

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