You Discover a Binary Star System in Which One Member

question 16

Multiple Choice

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

• A) It doesn't make sense to find a giant in a binary star system.
• B) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.
• C) 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.
• D) The two stars should be the same age, so the more massive one should have become a giant first.
• E) A star with a mass of 15 solar masses is too big to be a main-sequence star.

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