Refer to the figure. A Type I Cepheid has been located in an open cluster. The period of the Cepheid variable is 30 days and the variables apparent visual magnitude m is 10. First, use 12-1 to estimate the absolute visual magnitude, M . Calculate the distance to this open cluster? Hint: dpc = 10(m - M + 5) /5 using a scientific calculator.
A) 100 pc
B) 10,000 pc
C) 20 pc
D) 300 pc
E) 2500 pc
Correct Answer:
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