You Discover a Binary Star System in Which One Member

question 54

Multiple Choice

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)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 that such a system could be discovered.
• 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 15MSᵤn is too big to be a main-sequence star.

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