A handful of HR diagrams are available for you in high quality and definition. With many kinds and variety of the diagrams, you can save and print these diagrams for any educational or research purpose. So, what is actually this HR diagram? First and foremost, remember that there are a few hundred billion stars in our galaxy, the Milky Way and billions of galaxies in the Universe. One important technique in science is to try and sort or classify things into groups and seek out trends or patterns. Astronomers do this with stars, and they use this kind of diagram as a graphical tool that they use to classify stars according to their luminosity, spectral type, color, temperature and evolutionary stage. First diagram can be seen below, check out!
The Hertzsprung–Russell diagram, abbreviated HR diagram or HRD, is a scatter plot of stars showing the relationship between the stars’ absolute magnitude or luminosities versus their stellar classifications or effective temperatures. To put it more briefly, it plots each star on a graph measuring the star’s brightness against its temperature (color). However, it does not map any locations of stars. The name of the diagram itself is named after the Danish and American astronomers who independently developed versions of the diagram in the early Twentieth Century: Henry Norris Russell and Danish astronomer, Ejnar Hertzsprung.
Depending on its initial mass, every star goes through specific evolutionary stages dictated by its internal structure and how it produces energy. Each of these stages corresponds to a change in the temperature and luminosity of the star, which can be seen to move to different regions on the HR diagram as it evolves. This reveals the true power of the HR diagram – astronomers can know a star’s internal structure and evolutionary stage simply by determining its position in the diagram. You can see the details on these diagrams, like the ones posted as follows
This Hertzsprung-Russell diagram shows a group of stars in various stages of their evolution. All diagrams are printable and free to be saved, just click on the image to enlarge and save them.