We present the results of our new photometric observations of the chromospherically active star FR Cnc performed with a robotic telescope at the Zvenigorod Observatory of INASAN in March 2019. The observations were carried out from March 2 to 13, 2019, in the period of time that coincided most closely in time interval with the observations of this star with the Astrosat space telescope. A total of 450 magnitude estimates were obtained in each of the B, V, and R photometric bands over 12 days (from HJD 2458545.2 to HJD 2458556.5). Based on the V-band photometric variability of the star, we have constructed a map of surface temperature inhomogeneities. According to our estimate, the spot area on the surface of the star was ~12% of its total surface area in early 2019. On March 3, 2019, a flare on FR Cnc was detected during our observations at a time corresponding to HJD = 2458554.25891447 or rotation phase 0.8. The data for the flare suggest a rapid brightening of the star by 0.19^m in the B band and by 0.09^m in the V band; the flare lasted for about 60 min. The energy radiated in the flare was ITE_B = 2.17 × 10³³ erg and Ey = 1.40 × 10³³ erg in the B and V bands, respectively.

中文翻译：

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在INASAN的Zvenigorod天文台用机器人IRT-20望远镜观察到的红矮星FR Cnc的活动

我们将于2019年3月在INASAN的兹韦尼哥罗德天文台展示用自动望远镜对色球活动恒星FR Cnc进行的新光度学观测结果。观测时间为2019年3月2日至13日，在时间间隔上与用Astrosat空间望远镜观测到的这颗恒星最接近。在12天内，从B，V和R光度波段中的每个波段获得了总计450个幅度的估计（从HJD 2458545.2到HJD 2458556.5）。基于V波段的光度变异性，我们已经绘制了一张表面温度不均匀性图。根据我们的估计，恒星表面的斑点面积在2019年初约为其总表面积的12％。2019年3月3日，在我们观测期间，与HJD =对应的时间发现了FR Cnc的耀斑。 2458554.25891447或旋转相位0.8。耀斑的数据表明，恒星在B波段迅速增亮0.19 ^m，在V波段迅速增亮0.09 ^m。火光持续了大约60分钟。在喇叭口辐射的能量是ITE_乙= 2.17×10 ³³尔格和安永= 1.40×10 ³³尔格在乙和V波段。