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Astron. Astrophys. 341, 943-953 (1999)

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Ambiguities in fits of observed binary lens galactic microlensing events

M. Dominik

Institut für Physik, Universität Dortmund, D-44221 Dortmund, Germany

Received 6 March 1997 / Accepted 3 August 1998


For observed galactic microlensing events only one fit is usually presented, though, especially for a binary lens, several fits may be possible. This has been shown for the MACHO LMC#1 event (Dominik & Hirshfeld 1996). Here I discuss the strong binary lens events OGLE#7 and DUO#2. It is shown that several models with a large variety of parameters are in accordance with the photometric data. For most of the fits, 1-[FORMULA]-bounds on the fit parameters are given. The variation of the parameters within these bounds is in some cases considerable. It is likely that other binary lens events which will occur will have properties similar to the discussed events.

Key words: stars: planetary systems – stars: low-mass, brown dwarfs – stars: binaries: general – cosmology: dark matter – cosmology: gravitational lensing

Present address: Kapteyn Instituut, Rijksuniversiteit Groningen, Postbus 800, 9700 AV Groningen, The Netherlands (dominik@astro.rug.nl)

© European Southern Observatory (ESO) 1999

Online publication: December 16, 1998