Nitrogen and helium pollution in H II galaxies and AGNs

Details Nitrogen and helium pollution in H II galaxies and AGNs Nitrogen and helium pollution in H II galaxies and AGNs

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.205..123p&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 205, no. 1, p. 123-126.

Astronomy and Astrophysics

Astrophysics

Active Galactic Nuclei, Chemical Evolution, H Ii Regions, Helium, Nitrogen, Quasars, Red Shift

Scientific paper

The large nitrogen abundance that is inferred in both narrow and (at high redshift) broadline regions of AGNs, if real, could be due to global effects of galactic chemical evolution or to local pollution of the ionized region by winds from massive stars. In the latter case, one might expect to find an associated excess of helium, similar to (but larger than) what has been found in some H II galaxies showing broad spectral features due to embedded Wolf-Rayet stars. However, no clear sign of any excess of helium is found in Koski's (1978) data on Seyfert 2s.

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