Kinematics of planetary nebulae - Expansion velocities

Details Kinematics of planetary nebulae - Expansion velocities Kinematics of planetary nebulae - Expansion velocities

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..314b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 314-320.

Astronomy and Astrophysics

Astrophysics

16

H Alpha Line, Ion Distribution, Planetary Nebulae, Stellar Evolution, Velocity Measurement, Stellar Spectra, Velocity Distribution

Scientific paper

We present high-resolution (rp is about 10 exp 5) observations of 17 planetary nebulae in the lines of H-alpha and forbidden N II. For one object no expansion velocity determinations has existed so far, and for others measurements have existed only from other ions, mainly forbidden O III. The actual resolution, of about 3 km/s is decidedly better than that used in most previous works (typically 10-20 km/s). Absolute regression velocities are also given. Results are compared with previous determinations, and with existing theories on the PN shell formation and evolution. In particular, the relation expansion velocity vs nebular radius is shown for our objects and compared with other samples and current models.

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