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Expansion Velocities of [NII] and [OIII] from Compact Planetary Nebulae

Published online by Cambridge University Press:  19 July 2016

Katsunori Shibata  and
Shin'ichi Tamura
Katsunori Shibata
Affiliation:
Astronomical Institute, Tohoku University, Aobayama, SENDAI, 980, Japan
Shin'ichi Tamura
Affiliation:
Astronomical Institute, Tohoku University, Aobayama, SENDAI, 980, Japan

Extract

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We observed the expansion velocities, Vexp[NII] and Vexp[OIII] of angularly small planetary nebulae(PNe) and examined the relations between expansion velocities and distance free parameters like relative emission line intensities of HeIIλ4686, [OIII]A5007, and [NII]λ6583. The expansion velocities of PNe are usually obtained from the emission lines of [OIII]λ5007. But these quantities obtained from [NII]λ6583 are more suitable to investigate the evolution of PNe because 0++ region is confined within inner part for lower and intermediate excitation PNe.

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 190
Copyright
Copyright © Kluwer 1989