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What is a classic case of a white dwarf?

would be the classic case of a white dwarf as the companion of the Sun, Jupiter, Deneb, Sirius, or Alpha Centauri? I think the answer is b Sirius since Sirius is a white dwarf. Is this correct?

you're right. Sirius B was the first candidate identified a white dwarf, I think.

Classic Case “Hospitalized”