Main sequence stars can vary widely in terms of temperature and brightness, but they all share certain characteristics based on their mass. Here's a breakdown:
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Hot and Bright: These are massive main sequence stars. They are located on the upper left side of the main sequence on the Hertzsprung-Russell diagram. They have high temperatures (thousands of degrees Celsius) and high luminosities (brightness).
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Cool and Dim: These are low-mass main sequence stars. They are found on the lower right side of the main sequence. They have lower temperatures and luminosities.
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Cool but Bright or Hot but Dim: These scenarios generally do not apply to main sequence stars. On the main sequence, a star's brightness and temperature are directly correlated. Higher temperature generally means higher brightness.
So, in summary, main sequence stars can be categorized as either hot and bright or cool and dim, depending on their mass.