Three-dimenional Structure of the Ring Nebula

Details Three-dimenional Structure of the Ring Nebula Three-dimenional Structure of the Ring Nebula

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348701k&link_type=abstract

American Astronomical Society, AAS Meeting #213, #487.01; Bulletin of the American Astronomical Society, Vol. 41, p.461

Astronomy and Astrophysics

Astronomy

Scientific paper

The Ring Nebula (NGC 6720) has a main ring-like structure and multiple outer shells. In spite of extensive observations, the three-dimensional structure of the nebula is still unknown. We have modeled the Ring Nebula by a pair of co-axial bipolar cones and a tilted prolate ellipsoidal shell. The bipolar cones have a common axis perpendicular to the plane of the sky and have a common opening angle of 32 degrees. The lengths of inner and outer cones are 118 and 160 arc sec respectively. The central ellipsoidal shell has a major axis (a) of 85.0 arc sec and minor axes (b and c) of 59.3 arc sec and is tilted by 30 degrees from the line of sight and the bipolar axis. Assuming a velocity field, we have constructed a kinematic model to fit the observed position-velocity diagram of the nebula.

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