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Algol consists of a 3.7 msun main-sequence star and a 0.8 msun subgiant. why does this seem surprising, at least at first?

Algol consists of a 3.7 msun main-sequence star and a 0.8 msun subgiant. why does this seem surprising, at least at first?
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Algol consists of a 3.7 msun main-sequence star and a 0.8 msun subgiant. why does this seem surprising, at least at first?

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User SGhosh
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The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star.
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User Mohsen Mokhtari
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