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You are watching: Which of the following luminosity classes refers to stars on the main sequence?

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The Hertzsprung-Russell chart (HR diagram) is one of the most essential tools in the examine of mainly evolution. Occurred independently in the early on 1900s by Ejnar Hertzsprung and also Henry Norris Russell, the plots the temperature of stars against their luminosity (the theoretical HR diagram), or the colour of stars (or spectral type) versus their absolute magnitude (the observational HR diagram, additionally known together a colour-magnitude diagram).Depending top top its early mass, every star goes through details evolutionary step dictated through its interior structure and how that produces energy. Each of this stages synchronizes to a change in the temperature and also luminosity the the star, which deserve to be seen to relocate to various regions top top the HR diagram as it evolves. This reveals the true strength of the HR chart – astronomers deserve to know a star’s interior structure and evolutionary stage merely by determining its place in the diagram.

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The Hertzsprung-Russell chart the miscellaneous stages of mainly evolution. By much the most prominent attribute is the main sequence (grey), which runs from the top left (hot, luminous stars) come the bottom appropriate (cool, pass out stars) the the diagram. The gigantic branch and supergiant stars lie above the main sequence, and white dwarfs are found below it.Credit: R. Hollow, CSIRO.


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This Hertzsprung-Russell diagram shows a group of stars in various stages of their evolution. By far the most prominent attribute is the main sequence, which runs from the top left (hot, luminous stars) come the bottom ideal (cool, pass out stars) of the diagram. The large branch is likewise well populated and there are plenty of white dwarfs. Likewise plotted are the Morgan-Keenan luminosity classes that distinguish in between stars of the exact same temperature but different luminosity. -->There are 3 key regions (or evolution stages) of the HR diagram:

The sun is found on the main sequence through a luminosity that 1 and also a temperature of around 5,400 Kelvin.Astronomers generally use the HR diagram to one of two people summarise the evolution of stars, or to investigate the properties of a arsenal of stars. In particular, by plot a HR diagram for either a globular or open up cluster the stars, astronomers have the right to estimate the period of the cluster from wherein stars show up to turnoff the main sequence (see the entrance on main sequence for how this works).