You discover a binary star system in which one member is a, Ask an Expert

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You discover a binary star system in which one member is a 15MSun main-sequence star and the other star is a 10MSun giant. Why should you be surprised, at least at first?

A star with a mass of 15MSun is too big to be a main-sequence star.
The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable that such a system could be discovered.
The two stars should be the same age, so the more massive one should have become a giant first.
It doesn't make sense to find a giant in a binary star system.
The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants.

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