Reversal of the /O III/lambda 4363/Hgamma lambda 4340 ratio in the planetary nebula IC 4997

Details Reversal of the /O III/lambda 4363/Hgamma lambda 4340 ratio in the planetary nebula IC 4997 Reversal of the /O III/lambda 4363/Hgamma lambda 4340 ratio in the planetary nebula IC 4997

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..111f&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 1, 1979, p. 111-114.

Astronomy and Astrophysics

Astrophysics

16

Forbidden Transitions, Oxygen Spectra, Planetary Nebulae, Electron Density (Concentration), Electron Energy, Spectrographs, Spectrum Analysis, Time Dependence

Scientific paper

Five image-tube spectrograms of the planetary nebula IC 4997 obtained during August 1977 show that the intensity forbidden ratio O III 4363 A/H-gamma 4340 A was equal to unity, but a sixth one obtained in April 1978 showed the ratio to be 0.91. These results represent a significant increase in the intensity ratio, which had been declining from 1895 to 1962 (when it was considerably less than unity), and is interpreted as resulting from a gradual increase in temperature of the nebula's central star accompanied by a transient event which led to a temporarily high value for the ratio in mid-1977.

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