Ambiguities in fits of binary lens galactic microlensing events

Details Ambiguities in fits of binary lens galactic microlensing events Ambiguities in fits of binary lens galactic microlensing events

1997-02-28

arxiv.org/abs/astro-ph/9703003v2

Astron.Astrophys. 341 (1999) 943

Astronomy and Astrophysics

Astrophysics

36 pages in LaTeX2e format including 30 PostScript figures, final version accepted for publication in A&A

Scientific paper

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-sigma-bounds on the fit parameters are given. The variation of the parameters within the bounds is in some cases considerable. It is likely that other binary lens systems which will occur will have properties similar to the discussed events.

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