| Homework
#7 |
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| • | Q2.
If the stars turning off the main |
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| sequence
in the H-R diagram of a star |
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| cluster
have masses of about 15 times solar, |
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| how
old is the cluster? |
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| – | The
cluster will be about as old as the main |
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| sequence
lifetime. Can use lifetime (as
fraction |
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| of
solar lifetime) = 1/M2.5 and get 1/1000 of the |
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| solar
lifetime or look up in the table in the |
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| slides. 15 solar masses is about a B star which |
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| have
lifetimes of around 10 million years. |
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