Abundance anomalies in the Helix nebula

Details Abundance anomalies in the Helix nebula Abundance anomalies in the Helix nebula

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..370h&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, Aug.-Sept. 1978, p. 370-378.

Astronomy and Astrophysics

Astronomy

31

Abundance, Astronomical Spectroscopy, Line Spectra, Optical Emission Spectroscopy, Planetary Nebulae, Anomalies, Helium, Tables (Data), Ultraviolet Astronomy

Scientific paper

High-spatial-resolution observations of the Helix nebula (NGC 7293) are presented. The derived helium abundance is abnormally large, N(He)/N(H) at least about 0.17, and the oxygen abundance may be low. The N/O ratio is of order unity and therefore consistent with ratios observed in other planetaries with high helium abundance. In addition, the intensity of the forbidden Ne III line at 3869 A is correlated with that of the forbidden O II line at 3227 A, an effect also observed in the Ring and Dumbbell nebulae.

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