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T and R vary smoothly (and together) along the main sequence
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B stars are ~4 times hotter and ~10 times bigger than sun
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M stars are ~2 times cooler and ~10 times smaller than sun
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Presence of a line implies that a single fundamental property
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is varying to make some stars
B stars and some stars M stars
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That fundamental property then controls T, R
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A second property controls whether we get a giant or dwarfs
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Fundamental properties we could measure
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Location: Doesnt seem to be of major
importance
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Composition: Outside
composition of most stars similar (H, He, ...)
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Age: Will be important but put off till
Chapter 9
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Mass: Turns out to be the most important
parameter
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