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Caustics in special multiple lenses
Received 4 October 1999 / Accepted 21 January 2000
Despite its mathematical complexity, the multiple gravitational lens can be studied in detail in every situation where a perturbative approach is possible. In this paper, we examine the caustics of a system with a lens very far from the others with respect to their Einstein radii, and a system where mutual distances between lenses are small compared to the Einstein radius of the total mass. Finally we review the case of a planetary system adding some new information (area of caustics, duality and higher order terms).
Key words: cosmology: gravitational lensing stars: binaries: close stars: planetary systems
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Online publication: March 9, 2000