AAS 195th Meeting, January 2000
Session 110. Planetary Nebulae
Display, Saturday, January 15, 2000, 9:20am-4:00pm, Grand Hall

[Previous] | [Session 110] | [Next]

[110.09] Origin and Evolution of the Egg Nebula

G. Delamarter, A. Frank (U. Rochester), M. Vieira (U. Virgina), K. Wood (CfA), C. Welch (U. Rochester)

We report the results of new detailed numerical simulations of the Egg Nebula (CRL 2688). Our goal is to determine the correct mass loss history for the central star in terms of changes in mass loss rate and velocity. We also study time-dependent changes in the angular variation of both these quantities. Using a self-consistent treatment of H2 chemistry and cooling as well as post-processed scattered light images we have determining that the standard hydrodynamical Generalized Interacting Stellar Winds (GISW) Model can not create the structures observed in the Egg. Instead we find a model in which a gaseous torus is ejected first and is then followed by a collimated jet produce the best fit to the observations. Our models allow us to set constraints on the properties of both jet and torus.

This work was funded NSF Career Award AST-9702484

[Previous] | [Session 110] | [Next]