This is the term used to describe a medium-sized star. These stars are also known as “G dwarf stars” and “G-type main-sequence stars.” One notable characteristic of these stars is their size. Yellow dwarf stars are between 0.84 and 1.15 times the mass of our sun. Our sun (which is one solar mass) is a yellow dwarf star.
The phrase “yellow dwarf” isn’t quite right, because not all yellow dwarf stars are yellow. Some are white. Our sun is one of these; it is actually white. People perceive it as yellow because we view it through our atmosphere, which distorts its color.