# Exam2 - PHY180 Exam II Useful equations Brightness = 1/r2 d...

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PHY180 Exam II Useful equations: Brightness = 1/r 2 . d = K/π where K is 1 for parsec, 3.26 for light year, 206265 for AU Section 1 Please completely answer each of the following questions 1) Describe the life cycle of a star like our sun. Please start before the star is ‘born’ and include, at a minimum, the relative size, source of fuel (if any) for each stage, and what is left after the star dies. (10 pt) 2) Please describe the process we use to determine the age of a star cluster. Include, at a minimum, what assumptions we make, why it should work, and both how we tell both quite old and VERY young clusters. (10 pt) Section 2

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Please refer to the attached sheet of Color/Magnitude diagrams for M45, 47 Tuc, Hyades and M15 for the following questions. Order the 4 clusters from oldest to youngest. (2 pt) Oldest 1) ______________________ 2) ______________________ 3) ______________________ Youngest 4) ______________________ Order the 4 clusters from nearest to furthest from us. (2pt) Nearest 1) ______________________ 2) ______________________ 3) ______________________ Furthest 4) ______________________ Determine the age for each cluster. (2pt) 47 Tuc 1) ______________________ Hyades 2) ______________________ M45 3) ______________________ M15 4) ______________________
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Exam2 - PHY180 Exam II Useful equations Brightness = 1/r2 d...

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