A star on the main sequence of the Hertzsprung–Russell diagram. Dwarf stars are of luminosity class V. Most stars are of this type, as is the Sun. They range in mass from about 0.1 to 100 solar masses. The term is used because stars on the main sequence are smaller than those of the same mass which have evolved into giants. White dwarfs, black dwarfs, and brown dwarfs are not dwarfs in this sense of being main-sequence stars.