What Property of a Star Is the Main Indicator of Where It Will Lie on the Main Sequence?

The Hertzsprung-William Felton Russell plot (HR diagram) is i of the most important tools in the study of stellar evolution. Developed independently in the primeval 1900s by Ejnar Hertzsprung and Henry Russell, it plots the temperature of stars against their luminosity (the metaphysical 60 minutes diagram), or the colour of stars (or ghostlike type) against their absolute order of magnitude (the observational HR diagram, besides titled a coloring-magnitude plot).
Depending on its initial mass, all star goes done taxonomic group biological process stages dictated by its internal construction and how it produces DOE. Each of these stages corresponds to a change in the temperature and light of the star, which can be seen to move to different regions connected the HR plot as it evolves. This reveals the true magnate of the HR diagram – astronomers fire know a star's internal structure and biological process microscope stage simply past determinant its lay in the diagram.

The Hertzsprung-Russell diagram the various stages of stellar evolution. By far the most outstanding feature is the main sequence (grey), which runs from the upper left (hot, aglow stars) to the bottom right (water-cooled, faint stars) of the plot. The giant branch and supergiant stars lie above the main sequence, and white dwarfs are plant below IT.
Course credit: R. Hollow, CSIRO.

This Hertzsprung-Russell diagram shows a group of stars in various stages of their evolution. Out and away the all but prominent feature is the main sequence, which runs from the upper left (thermal, luminous stars) to the bottom right (cool, lightheaded stars) of the diagram. The giant branch is also recovered populated and there are many another white dwarfs. Also plotted are the Morgan-Keenan luminosity classes that distinguish between stars of the same temperature but different luminosity. -->
There are 3 main regions (or evolutionary stages) of the HR diagram:

1. The main sequence stretching from the upper left (hot, luminous stars) to the rear right (water-cooled, faint stars) dominates the HR diagram. Information technology is here that stars spend about 90% of their lives burning hydrogen into helium in their cores. Main sequence stars have a Morgan-Keenan luminosity class labelled V.
2. red giant and supergiant stars (brightness level classes I through III ) occupy the region above the main sequence. They have low surface temperatures and high luminosities which, according to the Stefan-Boltzmann law, means they also have hulky radii. Stars enter this biological process stage formerly they own exhausted the hydrogen fire in their cores and ingest started to burn atomic number 2 and other heavier elements.
3. white dwarf star stars (brightness class D) are the final evolutionary microscope stage of low to second mass stars, and are found in the bum left of the HR plot. These stars are very hot but have low luminosities due to their small size.

The Sun is found on the of import succession with a luminosity of 1 and a temperature of around 5,400 Kelvin.
Astronomers generally use the HR diagram to either summarise the phylogenesis of stars, or to investigate the properties of a collection of stars. In particular, by plotting a 60 minutes diagram for either a globular or open clump of stars, astronomers can estimate the age of the clump from where stars come along to turnoff the main sequence (check the submission connected main sequence for how this works).

What Property of a Star Is the Main Indicator of Where It Will Lie on the Main Sequence?

Source: https://astronomy.swin.edu.au/cosmos/h/hertzsprung-russell+diagram

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