Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-02
Astronomy and Astrophysics
Astrophysics
In the proceedings of the conference Physical Processes in Astrophysical Fluids. Will be published as a special volume of Phys
Scientific paper
10.1016/S0370-1573(98)00108-2
I summarize some recent models and ideas for the formation of axisymmetrical structures of planetary nebulae and the three rings of SN 1987A, as follows. (a) I review the general role of binary companions, including brown dwarfs and planets. (b) I propose a mechanism for axisymmetrical mass loss on the AGB that may account for the axially symmetric structures of elliptical planetary nebulae and that operates for slowly rotating AGB stars. (c) I propose a model for the formation of the two outer rings of SN 1987A, which is based on the numerical simulation of Soker (1989), and discuss a mechanism for their displacement from the exploding star.
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