Abell 43 and PG 0122+200: a Look at the Beginning and at the End of the PG 1159 Instability Strip
While Abell 43 is entering the PG 1159 instability strip, in fact as an "hybrid-PG 1159" nucleus of a planetary nebula, PG 0122+200 presently defines its red edge. So these two stars define the limits of the instability strip along the evolutionary sequence from the planetary nebula nuclei to the pre-white dwarf PG 1159 stars. We describe the new
Vauclair, G. et al.
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2007