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DIFFERENTIAL ASTROMETRY OF SUBARCSECOND SCALE BINARIES AT THE PALOMAR TESTBED INTERFEROMETER

机译:帕洛马尔测试干涉仪上亚秒尺度双星的微分天文学

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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 0.5 M_J 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.
机译:我们已经使用Palomar Testbed干涉仪对0.25英寸分离双星HD 171779进行了非常高精度的差分天文测量。在70分钟的观察中,我们在一个轴上实现了≈9μas的测量不确定度,与理论预期相符。四个晚上的夜间到夜间重复性为16μas。这种非常窄角的天体测量方法对于在以前被忽略的一类恒星(所谓的斑点双星)周围搜索质量小于0.5 M_J的行星可能非常有用。它还将提供恒星参数的测量,例如质量和距离,对于将恒星模型限制在10〜(-3)级别很有用。

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