An Ultramassive, Fast-Spinning White Dwarf in a Peculiar Binary System

[摘要]：White dwarfs typically have masses in a narrow range centered at about 0.6 solar mass (M-circle dot). Only a few ultramassive white dwarfs (mass > 1.2 M-circle dot) are known. Those in binary systems are of particular interest, because a small amount of a

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