Chemical Abundances and Kinematics of the Ring Nebula and Its Halos

Details Chemical Abundances and Kinematics of the Ring Nebula and Its Halos Chemical Abundances and Kinematics of the Ring Nebula and Its Halos

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487..328g&link_type=abstract

Astrophysical Journal v.487, p.328

Astronomy and Astrophysics

Astronomy

24

Ism: Abundances, Ism: Kinematics And Dynamics, Ism: Planetary Nebulae: Individual Ngc Number: Ngc 6720

Scientific paper

We have obtained new narrowband CCD images, spatially resolved intermediate- and high-dispersion spectroscopic observations of the Ring Nebula (NGC 6720). These data reveal that the bright main nebula is not a real ring, but a closed shell. A prolate ellipsoidal geometry for this shell is inferred from the observed tilts in the [N II] velocity ellipses at different position angles. The shell has enhanced densities near the equator; the shell surface is fragmented with protruding bubbles and outflows. The high-resolution spatially resolved echellograms allow us to identify the kinematic components associated with small-scale morphological features. The morphologically identified inner and outer halos show neither distinct kinematic discontinuity at the transition nor different chemical abundances, indicating that they have a common origin, the red giant wind. The kinematic and chemical properties of the Ring Nebula do not support the hypothesis that the Ring is a nearly pole-on bipolar nebula. We propose that the Ring Nebula contains a bubbling prolate ellipsoidal shell and a halo of remnant red giant wind, and that the combination of a nonisotropic excitation and the interaction of the main shell's bubbles and outflows with the surrounding red giant wind produces the petal-like morphology in the inner halo.

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