Magellanic Cloud Planetary Nebula with Suspected Strong Forbidden Iron Lines

Details Magellanic Cloud Planetary Nebula with Suspected Strong Forbidden Iron Lines Magellanic Cloud Planetary Nebula with Suspected Strong Forbidden Iron Lines

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pnas...80.1764a&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 80, Issue 6, pp. 1764-1766

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6

Scientific paper

The relatively high-excitation nebula (Westerlund-Smith object 25) in the large Magellanic cloud shows prominent forbidden lines of [Ar IV], the close [Ne IV] pair λ 4724, 4726, [Ca V] λ 5309, [Fe V] λ 4227, and probably [Fe VI] and [Fe VII], as well. A conventional interpretation of observations secured with a vidicon detector at the Cerro Tololo 4-m telescopes indicates an essentially ``normal'' helium abundance but depletions of N, O, Ne, and other elements with respect to our own galaxy. When a comparison is made with diffuse nebulae or H II regions in the large Magellanic cloud, we find helium to be more abundant, oxygen to be depleted, and nitrogen, neon, and argon to be comparable. The abundance of sulfur is uncertain. Iron in the gaseous phase is certainly more plentiful than in conventional planetaries.

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