What is main sequence fitting?
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A. It is a method for determining the distance to a star cluster by assuming that its main sequence should line up with the main sequence on a standard H-R diagram. read more
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. read more
Source: astro.unl.edu
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Source: astro.unl.edu