The structure of NGC 6720

Details The structure of NGC 6720 The structure of NGC 6720

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..297a&link_type=abstract

Astronomy and Astrophysics, vol. 66, no. 1-2, May 1978, p. 297-305. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

29

Electronography, Emission Spectra, Fabry-Perot Interferometers, Planetary Nebulae, Radial Velocity, Velocity Distribution, Astronomical Models, Giant Stars, Ionization Potentials, Monochromatic Radiation, Oxygen Spectra, Spectral Resolution, Stellar Spectra, Wavelengths

Scientific paper

A Fabry-Perot interferometer has been used to measure velocity structure in the forbidden O III line at 5007 A in the envelope of NGC 6720. An electronographic image converter has been used to obtain monochromatic exposures in emission lines covering a wide range of ionization potential. These data are shown to imply that the envelope is shell-like in form and not toroidal, as previously suggested.

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