5 months ago
Last edited at 7:21PM on 10/6/2013
The only type of dwarf star that I can think of with high temperature and low luminosity is a white dwarf. Much of a white dwarf's heat is stored in its interior, while the surface, whose matter differs from the matter comprising the interior, possesses a temperature that is considerably lower than the interior's. This causes white dwarfs to appear dim. Given its small size, a white dwarf is able to radiate its heat away at a slower rate than other stars, which is why white dwarfs can retain their heat for trillions of years.