Wiktionary
n. (context astronomy English) a hypothetical class of star developing from a red dwarf.
Wikipedia
A blue dwarf is a predicted class of star that develops from a red dwarf after it has exhausted much of its hydrogen fuel supply. Because red dwarfs fuse their hydrogen slowly and are fully convective (allowing their entire hydrogen supply to be fused, instead of merely that in the core), the Universe is currently not old enough for any blue dwarfs to have formed yet, but their future existence is predicted based on theoretical models.
Stars increase in luminosity as they age, and a more luminous star needs to radiate energy more quickly to maintain equilibrium. Stars larger than red dwarfs do this by increasing their size and becoming red giants with larger surface areas. Rather than expanding, however, red dwarfs with less than 0.25 solar masses are predicted to increase their radiative rate by increasing their surface temperatures and becoming "bluer". This is because the surface layers of red dwarfs do not become significantly more opaque with increasing temperature.
Blue dwarfs eventually evolve into white dwarfs once their hydrogen fuel is completely exhausted, which in turn will eventually cool to become a black dwarf.
The term blue dwarf may refer to:
Usage examples of "blue dwarf".
They were not only incredibly alien but with all their para-abilities, a single blue dwarf was far superior to a single man.
In the sword's blue dwarf light, the powdered birdshit that covered me sparkled and glowed!
The far more preponderant gravitation of the blue dwarf exercised its dominant influence and forced the craft into a new course.
Idran was a blue dwarf star of eight uninhabited planets and, Vaughn knew, at a distance of three light-years, was the nearest Gamma Quadrant system to the wormhole.
A giant red star was accompanied by a small blue dwarf, which only had one planet.
The mode of illumination and the oppressive room temperature indicated that this creature had come from a planet with a hot and brilliant blue dwarf sun.
The Drusus cruised along according to plan in its prescribed area, which was a particularly vacuous region of space, 45 light-years distant from the blue dwarf star Vollaal.