Implications for Stars
Stars less massive than 1.4 MSun can end as white dwarfs
Stars more massive than 1.4 MSun can end as white dwarfs,
if they lose enough of their mass (during PN stage) that
they end up with less than 1.4 MSun
Stars whose degenerate cores grow more massive than 1.4
MSun will undergo a catastrophic core collapse:
Neutron stars
Supernova