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Astron. Astrophys. 355, 423-432 (2000)
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
Abstract
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
This article contains no SIMBAD objects.
Contents
- 1. Introduction
- 2. Basics of multiple lensing
- 3. Single lens perturbed by far masses
- 4. Close multiple lenses
- 5. Planetary systems
- 5.1. Central caustic
- 5.2. Planetary caustics
- 6. Conclusions
- Acknowledgements
- References
© European Southern Observatory (ESO) 2000
Online publication: March 9, 2000
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