Statistics – Computation
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..639d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 639-650.
Statistics
Computation
58
Astrodynamics, H Beta Line, Magellanic Clouds, Planetary Evolution, Planetary Nebulae, Stellar Spectra, Computational Astrophysics, Emission Spectra, Line Of Sight, Radial Velocity, Stellar Evolution
Scientific paper
The radial velocity and expansion velocity in the forbidden O III 5007 line have been determined for a sample of 94 PN in the LMC. In addition, densities and expansion velocities have been determined for a subset of 44 objects in both the LMC and SMC using the forbidden O II 3727, 3729 doublet. With a few notable exceptions, the forbidden O II expansion velocities are well correlated with, but are systematically higher than, the forbidden O III expansion velocities. For a given excitation class, there appears to be an upper limit to the density, in the sense that very high density objects are always of low excitation, but low-density objects can occur at any excitation. The population of PN in the Magellanic Clouds appears to form a sheet in dynamical age/excitation class/nebular density space, and therefore represents a two-parameter family. The implication of this is that the nebular parameters are entirely determined by the properties of the central star. This fact could represent the basis of a solution to the distance scale problem for Galactic PN.
Dopita Michael A.
Ford Holland C.
Meatheringham Stephen J.
Webster Louise B.
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