Physics – Plasma Physics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.182...13g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 182, Jan. 1978, p. 13-25. Research supported by the Science Research Co
Physics
Plasma Physics
21
Interstellar Gas, Neutral Gases, Planetary Nebulae, Plasma Physics, Rarefied Gas Dynamics, Astronomical Models, Atomic Excitations, Nitrogen, Oxygen Spectra
Scientific paper
An electronographic insect-eye Fabry-Perot spectrograph has been used to obtain profiles of the forbidden O III, forbidden N II, and forbidden O I emission lines at many positions over the Dumbbell Nebula. Narrow forbidden O I and forbidden N II lines are observed from the central areas. These are split into two distinct components separated by around 66 km/s. However, broader forbidden O III lines, though often doubled by only about 30 km/s, are observed. A cylindrical (or ellipsoidal) shell model of the nebula, expanding radially with respect to its axis rather than the central star, explains many of the observations. Very unusual motions are observed near the exciting star
Goudis Ch.
McMullan David
Meaburn John
Tebbutt N. J.
Terrett David L.
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