Differential Astrometry of Subarcsecond Scale Binaries at the Palomar Testbed Interferometer
Differential Astrometry of Subarcsecond Scale Binaries at the Palomar Testbed Interferometer
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帕洛玛试验台干涉仪上亚秒级双星的差分天体测量
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发表时间：
2003
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通讯作者：
M. Muterspaugh
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作者：
B. Lane;M. Muterspaugh
我们利用Palomar实验台干涉仪对0.25 ″分离双星星星HD 171779进行了高精度的差分天体测量。在70分钟的观测中，我们在一个轴上实现了109 μas的测量不确定度，与理论预期一致。四个夜晚的夜间重复性为16 μ s。这种非常窄角的天体测量方法对于寻找质量小到0.5兆焦耳的行星可能是非常有用的，这些行星围绕着以前被忽视的一类恒星，即所谓的斑点双星。它还将提供恒星参数的测量，如质量和距离，有助于将恒星模型限制在10-3水平。
We have used the Palomar Testbed Interferometer to perform very high precision differential astrometry on the 0.″25 separation binary star HD 171779. In 70 minutes of observation, we achieve a measurement uncertainty of ≈9 μas in one axis, consistent with theoretical expectations. Night-to-night repeatability over four nights is at the level of 16 μas. This method of very narrow angle astrometry may be extremely useful for searching for planets with masses as small as 0.5MJ around a previously neglected class of stars—so-called speckle binaries. It will also provide measurements of stellar parameters such as masses and distances, useful for constraining stellar models at the 10-3 level.