Answer: A Cepheid variable star is a star whose brightness alternately increases and
Chapter 3, Problem 81(choose chapter or problem)
A Cepheid variable star is a star whose brightness alternately increases and decreases. The most easily visible such star is Delta Cephei, for which the interval between times of maxi - mum brightness is 5.4 days. The average brightness of this star is 4.0 and its brightness changes by . In view of these data, the brightness of Delta Cephei at time , where is mea-
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