A giant star would experience a supernova explosion, in order to become a white dwarf.
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No, Pollux is not a white dwarf star. It is an orange giant star that is nearing the end of its life cycle. White dwarfs are remnants of stars like the Sun after they have exhausted their nuclear fuel.
Before a white dwarf, a star would undergo the red giant phase. After a white dwarf, a star may end its life cycle as a black dwarf, although no black dwarfs are currently known to exist in the universe due to the long timescales required for a white dwarf to cool down.
because its biger
When the sun dies, it will turn into a white dwarf. A white dwarf is a small, dense star that forms when a medium-sized star like the sun exhausts its nuclear fuel.
None of those is a main sequence star.