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Astron. Astrophys. 355, 423-432 (2000)

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Caustics in special multiple lenses

V. Bozza

Dipartimento di Scienze Fisiche E.R. Caianiello, Università di Salerno, 84081 Baronissi, Salerno, Italy

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

Correspondence to: valboz@physics.unisa.it

© European Southern Observatory (ESO) 2000

Online publication: March 9, 2000