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Thanks for replies, Michael and John.
My query arose from an examination question that asks under what
circumstances a white dwarf can be the outcome of a main sequence
star at the high mass upper left end. A colleague was asserting that
the required mass loss would have to occur during the supernova,
which didn't seem to make sense. Indeed, the helium flash/planetary
nebula process is what I had in mind... but this avoids the supernova.
Thanks again.
Mark.