Abstract
A hypothesis that planetary nebulae originate from red giants when the helium burning begins in the degenerate helium core is proposed and examined quantitatively. It is assumed that the shock wave is generated by the rapid core expansion which is caused by the removal of degeneracy at the helium core. The propagation of the shock wave is analysed by the quasi-stationary method. The obtained expansion velocity and thrown mass are 95 km/sec and 0.5M⊙ respectively. A relation between remnant stars and nuclei of planetary nebulae is also discussed briefly.
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