Based on high-precision data from the archive of the TESS space mission, a study is made of the photometric variability of the brightness of HIP 94235, a bright star belonging to the 120 million years old moving group AB Doradus. We obtained an estimate for the rotation period of the star and the amplitude of the brightness variability, as well as an estimate of 31750 m.s.h. for the spottedness parameter A in an absolute measure, substantially greater than the density of spots on the Sun. During the interval of the observations with the TESS space mission there were no manifestations of flare activity on HIP 94235, For each sector of the observations which sequentially cover one period of the star’s rotation, the inverse problem of recovering maps of the surface temperature inhomogeneities of the star from the light curve was solved for the position of the active regions and to study their time evolution. The differential rotation parameter of the star ∆Ω =0.038 ± 0.07 rad/d is estimated from the relative differences in the displacements of the active regions. The results are compared with data on another young solar-type star with an exoplanet which we have studied, TOI 837, a member of the southern cluster IC 2602 with an age of 35 million years.

基于TESS太空任务档案的高精度数据，研究了HIP 94235亮度的光度变化，这颗亮星属于1.2亿年的移动星团AB Doradus。我们获得了恒星自转周期和亮度变化幅度的估计值，以及斑点参数 A 的绝对值估计值 31750 msh，远大于太阳上的斑点密度。在 TESS 太空任务的观测间隔期间，HIP 94235 上没有任何耀斑活动的表现，对于依次覆盖恒星自转一个周期的观测的每个扇区，从光变曲线恢复恒星表面温度不均匀性图的反问题解决了活动区的位置，并研究了它们的时间演化。恒星的微分旋转参数 ∆Ω =0.038 ± 0.07 rad/d 是根据活动区位移的相对差异估算的。将结果与我们研究过的另一颗带系外行星的年轻太阳型恒星 TOI 837 的数据进行了比较，TOI 837 是南部星团 IC 2602 的成员，年龄为 3500 万年。