Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..598c&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Aug. 1984, p. 598-602. Research supported by the Wi
Astronomy and Astrophysics
Astronomy
21
Astronomical Spectroscopy, Planetary Nebulae, Charge Coupled Devices, Kinematics, Oxygen Spectra, Velocity Measurement
Scientific paper
The expansion velocity-radius (R-V) relation for planetary nebulae is reexamined using the existing measurements of expansion velocities and recent calculations of radii. It is found that some of the previously alleged R-V relations for PN are not convincingly established. The scatter in the R-V plots may be due largely to stratification of ions in individual nebulae and to heterogeneity in the planetary nebula population. In addition, from new echelle/CCD observations of planetary nebulae, it is found that spatial information is essential in deriving the internal kinematic properties. Future investigations of R-V relations should be pursued separately for groups of planetaries with similar physical properties, and they should employ observations of appropriate low excitation lines in order to measure the expansion velocity at the surface of the nebula.
Chu Y.-H. Y.-H.
Jacoby George H.
Kaler James B.
Kwitter Karen B.
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