Most stars are main sequence stars.
Other prominent groupings of stars, which we will discuss in this article, are the red giants, yellow and red supergiants, and white dwarfs. The Hertzsprung-Russell diagram. The diagram shows the main sequence, red giants, supergiants, and white dwarfs. In addition, we identify the location of the Sun, the twelve brightest stars visible from the Northern Hemisphere , and the white dwarf companions of Sirius and Procyon. Hertzsprung was the first to publish a plot of stellar brightness vs. surface temperature.