双星的光偏转
Light deflection in binary stars
摘要：
研究了双星系统中一个分量的光在另一个分量的引力场作用下的偏转。虽然这种相对论效应迄今还没有被观察到，但问题是，鉴于今天的高精度天体测量很快将达到微弧秒的精度水平，这种效应是否可以被检测到。的效果进行了研究，并调查其可观性。事实证明，总共有大约1000个双星具有轨道参数，使得光偏转量至少为1微弧秒。提出了两个严格的轨道参数判据，利用这两个判据可以很容易地确定给定双星系统的最大光偏转效应。结果发现，对于相关的双星，它们的轨道参数必须采取相当极端的值，以便有几微弧秒量级的光偏转。只有在极少数和相当极端的双星系统中，光偏转效应可能被今天的天体测量学探测到，但它们的存在是非常不可能的。因此，探测相对论的这种微妙效应仍然是未来天体测量任务的一个挑战。
英文摘要：
The light deflection of one component of a binary system due to the gravitational field of the other component is investigated. While this relativistic effect has not been observed thus far, the question arises that whether this effect becomes detectable in view of todays high-precision astrometry which soon will reach the microarcsecond level of accuracy. The effect is studied and its observability is investigated. It turns out, that in total there are about 1000 binaries having orbital parameters such that the light deflection amounts to be at least 1 microarcsecond. Two stringent criteria for the orbital parameters are presented, by means of which one can easily determine the maximal value of light deflection effect for a given binary system. It is found, that for relevant binaries their orbital parameters must take rather extreme values in order to have a light deflection of the order of a few microarcseconds. Only in a very few and rather extreme binary systems the light deflection effect might be detectable by todays astrometry, but their existence is highly improbable. Thus, the detection of this subtle effect of relativity still remains a challenge for future astrometric missions.
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