What characteristics define blue dwarf stars?

I will assume that by Blue dwarf you mean a blue main sequence star. (Regulus, a blue main sequence star.) -Blue main sequence stars are located in the B & O spectral classes. -Blue main sequence stars have a mass between 2x to over 30x the mass o... read more

A blue dwarf is a hypothetical star that is created from a red dwarf star that has exhausted most of its hydrogen fuel supply. Red dwarf stars fuse hydrogen very slowly, and they can allow a large amount of their hydrogen to be fused, which means that the creation of a blue dwarf star takes an incredibly long time. read more

By definition, a black dwarf is a former white dwarf that has cooled to invisibility. They do not exist yet. No white dwarf stars have cooled enough to be considered black dwarf s. The coolest white dwarf stars known are at temperatures of 3900 K. read more

Yellow dwarfs are main-sequence (dwarf) stars with masses comparable to that of the Sun. Orange dwarfs are K-type main-sequence stars. A blue dwarf is a hypothesized class of very-low-mass stars that increase in temperature as they near the end of their main-sequence lifetime. read more