Abstract
We investigate analytically gravitational lensing by charged, stationary, axially symmetric Kerr‐Sen dilaton‐axion black hole in the weak deflection limit. Approximate solutions to the lightlike equations of motion are present up to and including third‐order terms in M/b, a/b and rα/b, where M is the black hole mass, a is the angular momentum, rα = Q2/M,Q being the charge and b is the impact parameter of the light ray. We compute the positions of the two weak field images up to post‐Newtonian order. The shift of the critical curves as a function of the lens angular momentum is found, and it is shown that they decrease slightly with the increase of the charge. The lensing observables are compared to these characteristics for particular cases as Schwarzschild and Kerr black holes as well as the Gibbons‐Maeda‐Garfinkle‐Horowitz‐Strominger black hole.
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