2017年IAO理论低年组第1题-双星

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高年组对应题目：2017年IAO理论高年组第1题-双星

英文题目

a-I. Double star. A double star consists of components by all physical characteristics equal to α Centauri A and α Centauri B, which are rotating around the common center of gravity by circular orbits. As observed from the Earth the angular distance between the components varies from 0.17" till 2.2" with a period of τ= 39.6 years. Find the distance to the double star.