Origin and Evolution of the Egg Nebula

Details Origin and Evolution of the Egg Nebula Origin and Evolution of the Egg Nebula

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19511009d&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #110.09; Bulletin of the American Astronomical Society, Vol. 31, p.1537

Astronomy and Astrophysics

Astronomy

Scientific paper

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

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