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Rob Jeffries has covered pretty much everything in his answer, but I'll add that this is a question with a long history, enough that there is a famous answer to it called the Russell-Vogt or Vogt-Russell Theorem. That states that composition and mass are the two key properties, assuming that the star is in hydrostatic equilibrium and derives its energy from ...


Starting from a protostar, one would hope to be able to predict everything about its future development if we knew its initial mass, chemical composition and angular momentum. Mass is fundamental because it determines how much fuel the star will have and the pressure at its core. Composition is key because among other things it determines the opacity of the ...


The color index of the star can give you that information. I can look it up for you if I know which exoplanet you're interested in, or you can find it in the NASA Exoplanet Database here.


It can tell you the chemical composition of the star. what elements are present and this can help you tell other things about the star. For example, the oldest stars are metal poor meaning they formed earlier in the history of the universe. Younger stars are expected to have more metal in them. Also the energy of the spectral lines of the elements are well ...

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