How are white dwarfs treated in the luminosity class definitions?
A) They are considered a subgroup of main sequence stars, class Vb.
B) They are class VI.
C) They are not given a classification because they have not yet begun to produce energy by nuclear fusion.
D) They are not given a classification because they no longer create energy by nuclear fusion.

Question

Quizplus · Accepted Answer

White dwarfs are not classified within the traditional luminosity classes because they are remnants of stars that have exhausted their nuclear fuel and no longer undergo nuclear fusion. They emit light and heat primarily through the slow release of their stored thermal energy.

How Are White Dwarfs Treated in the Luminosity Class Definitions