Stars are the most glittering objects in the night sky. It is really an interesting subject to know about the stars and astronomers rely upon different methods to understand all the important things about the stars. A star is a massive and luminous plasmatic ball and all the plasma is held together by gravity. The shine of a star is mostly based on the thermonuclear fusion of hydrogen gas that happens in the center of the stars. It releases energy and radiates to outer space which makes them luminous. The radiance of a star helps scientists to determine its age along with its mass and most importantly the chemical composition. The total mass of a star determines the ultimate fate of the star and its evolution. The diameters, rotation, its movement in the sky are some very important features for the astronomers to decide the fate of the star. Also, by the Hertzsprung-Russell diagram, the astronomers can determine the age and the state in which the star is. It is also very important to determine the evolutionary stage of the star.
According to Moché, “Hertzsprung-Russell (HR) diagram is a plot of luminosity versus temperature.” As per Miller, “The Hertzsprung- Russell Diagram is a scattered graph of stars” and is one of the very important documents in the understanding of the lives of the stars. It shows the relation of the “absolute magnitude of the stars,” or in some cases the “luminosity against the spectral type, even the different classifications, and effective temperatures.” They do not represent the maps of a star and even not a picture or location determiner. On the other hand, they basically plot the star on a graph and on the way measure the absolute magnitude (or in some cases the brightness) against the temperature and the color of the star.