Other
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..649r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 649-657.
Other
90
Astrometry, Planetary Nebulae, Radial Velocity, Emission Spectra, Expansion, Fabry-Perot Interferometers, Forbidden Transitions, Oxygen Ions, Radii
Scientific paper
A scanning Fabry-Perot interferometer is used on the 1.5-m flux collector, Tenerife, to obtain forbidden O III 5007 A emission line profiles at the centers of 33 planetary nebulae. The observations are made at a resolution of approximately 3 km/s through entrance apertures of 5, 10 or 18 arcsec diameter. Small young nebulae are chosen to form the majority of the sample, and the shell expansion velocities are deduced from the observations using a simple spheroidal model for the nebular shell. These new data, together with published expansion velocity data for other nebulae, are used to investigate the relationship between the expansion velocities and the nebular radii. It is shown that two possible relationships exist; a comparison with theoretical radiation pressure-driven nebular shell models implies two distinct evolutionary sequences characterizing nebulae of 'high' and 'low' mass.
Atherton P. D.
Reay N. K.
Robinson John G.
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