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| Paper: |
Planetary Nebulae after Common-Envelope Phases Initiated by Low-Mass Red Giants |
| Volume: |
469, 18th European White Dwarf Workshop (EUROWD12) |
| Page: |
297 |
| Authors: |
Hall, P. D.; Tout, C. A.; Izzard, R. G.; Keller, D. |
| Abstract: |
It is likely that at least some planetary nebulae are composed of matter which was ejected from a binary star system during common-envelope (CE) evolution.
A large fraction of CE phases are thought to be initiated by low-mass red giants — giants with inert, degenerate helium cores.
We investigate which of these systems are expected to form planetary nebulae by constructing a set of model CE remnants of such stars.
Existing model remnants evolve too slowly to the effective temperatures required to form planetary nebulae.
However, these model remnants detach from Roche lobes which are larger than those at the end of some CE phases.
Our set of models includes stars which have smaller final Roche lobes and thus greater mass loss during the CE phase so that they evolve much more rapidly to high effective temperatures.
Because of this we find that more CE remnants of low-mass red giants could become planetary nebulae. |
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