The forbidden N II/H-alpha ratio in NGC 6888

Details The forbidden N II/H-alpha ratio in NGC 6888 The forbidden N II/H-alpha ratio in NGC 6888

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..873p&link_type=abstract

Astrophysical Journal, Part 1, vol. 224, Sept. 15, 1978, p. 873-879, 881, 883, 884.

Physics

Optics

42

Abundance, H Alpha Line, Hot Stars, Nebulae, Nitrogen, Stellar Spectrophotometry, Cassegrain Optics, Data Reduction, H Ii Regions, Red Shift, Supernova Remnants, Ultraviolet Spectra, Wolf-Rayet Stars

Scientific paper

Emission-line ratios have been obtained for a large number of individual knots in NGC 6888. The observations indicate that the variation of the forbidden N II/H-alpha ratio across the face of the nebula is due to a variation in ionization. N and He are also shown to be overabundant relative to normal H II regions in the Galaxy. It is therefore concluded that there is large-scale mixing in Wolf-Rayet stars prior to shell ejection.

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