A white dwarf is a star with a high temperature but a low luminosity, so a white dwarf is a correct answer. It is substantially hotter (25,000 K), yet its brightness is low due to its small size.
White dwarfs are stars that have used up all of their hydrogens as nuclear fuel.
Fusion in a star's core generates heat and outward pressure, but the inward force of gravity caused by the star's mass keeps this pressure in check.
The surface temperature of a white dwarf falls as it cools, the radiation it produces reddens, and its luminosity decreases.
For more information about White Dwarf, refer below
https://brainly.com/question/861894