The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 21 2 2021 08 23 Perturbation effect of stellar spots on light curves of gravitational microlensing Perturbation effect of stellar spots on light curves of gravitational microlensing 293 300 1695 10.47176/ijpr.21.2.91118 FA S Sajadian ‎ Department of Physics, Isfahan University of Technology, Isfahan, Iran M Rashidi ‎ Department of Physics, Isfahan University of Technology, Isfahan, Iran Journal Article 2020 09 09 One of the advantages of observations of gravitational microlensing is stellar spots detection.  Our aim ‎in this paper is to study and characterize the perturbations due to stellar spots on the microlensing ‎light curves. Considering a suitable formalism for the stellar spots, we simulate the microlensing of ‎spotted source stars. One of the effects of a spot on stellar light curve is the local demagnification (where ‎the lens is crossing the stellar spot) and it causes asymmetric perturbations on the light curve. The ‎spots that locate at the source center after projection make larger and deeper perturbations than the ‎spots locate the stellar limbs. In caustic crossing binary microlensing events, the typical-size spot-‎induced perturbations mostly make (more than 40‏‎ percent) the relative deviations larger than ‎‏5‏‎. This ‎fraction is bigger for single lensing events‎‎‎.‎ One of the advantages of observations of gravitational microlensing is stellar spots detection.  Our aim ‎in this paper is to study and characterize the perturbations due to stellar spots on the microlensing ‎light curves. Considering a suitable formalism for the stellar spots, we simulate the microlensing of ‎spotted source stars. One of the effects of a spot on stellar light curve is the local demagnification (where ‎the lens is crossing the stellar spot) and it causes asymmetric perturbations on the light curve. The ‎spots that locate at the source center after projection make larger and deeper perturbations than the ‎spots locate the stellar limbs. In caustic crossing binary microlensing events, the typical-size spot-‎induced perturbations mostly make (more than 40‏‎ percent) the relative deviations larger than ‎‏5‏‎. This ‎fraction is bigger for single lensing events‎‎‎.‎ https://ijpr.iut.ac.ir/article_1695_e721a54a8cf18c8543d44782d9ef681f.pdf