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Estimate of the accuracy of the linear-caustic approximation in analyses of gravitational microlensing observations

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Abstract

The amplification coefficient for gravitational lensing of a point source in the linear-caustic approximation is compared with exact values calculated for a lens comprised of two point masses. Even in the most favorable case for the caustic crossing, the error in the amplification coefficient remains below 1% only for distances to the caustic not exceeding 0.01 of the Einstein radius.

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Authors and Affiliations

  1. N.G. Chernyshevskii State University, Saratov, Russia

    M. B. Bogdanov

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  1. M. B. Bogdanov
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Correspondence to M. B. Bogdanov.

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Original Russian Text © M.B. Bogdanov, 2014, published in Astronomicheskii Zhurnal, 2014, Vol. 91, No. 10, pp. 785–788.

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Bogdanov, M.B. Estimate of the accuracy of the linear-caustic approximation in analyses of gravitational microlensing observations. Astron. Rep. 58, 688–691 (2014). https://doi.org/10.1134/S1063772914100035

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  • DOI: https://doi.org/10.1134/S1063772914100035

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