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Main sequence fitting also determines distances using the HR Diagram but is always applied to clusters of stars. These stars are gravitationally bound, all located at the same distance, and formed at the same time from the same cloud of gas and dust. It is assumed that the members of a cluster will be found at the same locations as stars in general on the HR diagram. Thus, 90% of the cluster stars are on the main sequence.
In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as HertzsprungâRussell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell.fter the hydrogen fuel at the core has been consumed, the star evolves away from the main sequence on the HR diagram. The behavior of a star now depends on its mass, with stars below 0.23 M â becoming white dwarfs directly, whereas stars with up to ten solar masses pass through a red giant stage.