Gravitational microlensing by a single star plus external shear

Statistics – Computation

Scientific paper

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Caustics (Optics), Gravitational Lenses, Magnification, Probability Distribution Functions, Stellar Mass, Computational Astrophysics, Double Stars, Mass Distribution

Scientific paper

Gravitational microlensing by a single star plus external shear is considered. It is shown that for a general cusp the magnification probability distribution follows pc(A)dA of about (A exp -7/2)dA for sufficiently large magnifications. An adaptive grid technique is developed to calculate the magnification probability distributions. The results could be useful for cases of microlensing where the surface-mass density is low.

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