The existence of a massive black hole in the center of the Milky Way, coinciding with the radio source Sgr A*, is being established on more and more solid grounds. In principle, this black hole, acting as a gravitational lens, is able to bend the light emitted by stars moving within its neighborhood, eventually generating secondary images. Extending a previous analysis of the gravitational lensing phenomenology to a new set of 27 stars, whose orbits have been well determined by recent observations, we have calculated all the properties of their secondary images, including time and magnitude of their luminosity peaks and their angular distances from the central black hole. The best lensing candidate is represented by the star S6, since the magnitude of its secondary image at the peak reaches K = 20.8, with an angular separation of 0.3 mas from the central black hole, which is just at the borders of the resolution limit in the K band of incoming astronomical instruments.
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机译：在银河系中央存在着一个巨大的黑洞，与无线电源Sgr A *吻合，这一点正在越来越多的坚实基础上得到证实。原则上，这个黑洞充当引力透镜，能够弯曲在其附近移动的恒星发出的光，最终生成二次图像。将先前对引力透镜现象的分析扩展到一组新的27颗恒星，这些恒星的轨道已由最近的观测很好地确定，我们已经计算了它们的副像的所有属性，包括它们的光度峰的时间和大小以及它们的角距离从中央黑洞。最好的透镜候选者是用恒星S6表示，因为它的二次图像在峰值处的大小达到K = 20.8，与中心黑洞的间距为0.3 mas，这恰好位于分辨率极限的边界。即将到来的天文仪器的K波段。
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