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Main sequence not quite
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constant R
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B stars: R ~10 RSun
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M stars: R ~0.1 RSun
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Betelgeuse:
R~ 1,000 RSun
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Larger than 1 AU
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White dwarfs: R~
0.01 RSun
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A few Earth radii
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What causes the “main sequence”?
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Why “similar” size, with
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precise R related to T?
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Why range of T?
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Why are a few stars (giants, white
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dwarfs) not on main sequence?
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