On the Origin of Planetary Nebula K648 in Globular Cluster M15

J. F. Buell, R. B. C. Henry, E. Baron, K. B. Kwitter
1997 Astrophysical Journal  
We examine two scenarios for formation of the planetary nebula K648: a prompt scenario where the planetary nebula is ejected and formed immediately after a helium shell flash and a delayed scenario where a third dredge up occurs and the envelope is ejected during the following interpulse phase. We present models of both scenarios and find that each can produce K648-like systems. We suggest that the prompt scenario is more favorable but cannot rule out the delayed scenario.
doi:10.1086/304273 fatcat:dljpd2pr7bcvdivlfiezqdtu7a