What specific stellar remnant classification is assigned to the faint companion star, Sirius B?
Answer
White dwarf
Sirius B is classified as a white dwarf, which represents a later evolutionary stage for a star. A white dwarf is the dense, hot, and compact remnant left behind after a star similar in mass to Sirius A has completely exhausted its nuclear fuel reserves. These objects are characterized by extreme density, packing a substantial fraction of the Sun's mass—around 0.98 solar masses—into a remarkably small volume, comparable in size to the Earth.
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