"Dying" is a bit of an under-statement. A white dwarf is to all intents and purposes dead. It has no source of energy, and radiates only because of stored heat.
That heat dissipates so slowly that (AIUI) no white dwarf in the universe has yet had time to cool down enough to stop radiating (i.e. the universe does not yet contain any black dwarves).
So a star that is in the process of collapsing into a white dwarf could reasonably be said to be "dying". Once it's collapsed, it's dead.
That heat dissipates so slowly that (AIUI) no white dwarf in the universe has yet had time to cool down enough to stop radiating (i.e. the universe does not yet contain any black dwarves).
So a star that is in the process of collapsing into a white dwarf could reasonably be said to be "dying". Once it's collapsed, it's dead.