Spottedness Activity of the Young Star HIP 94235 from the Moving Group AB Doradus

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.