Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-07-08
Astrophys.J.640:299-307,2006
Astronomy and Astrophysics
Astrophysics
18 pages, 9 figures, submitted to ApJ
Scientific paper
10.1086/500101
We reexamine the usefulness of fitting blended lightcurve models to microlensing photometric data. We find agreement with previous workers (e.g. Wozniak & Paczynski) that this is a difficult proposition because of the degeneracy of blend fraction with other fit parameters. We show that follow-up observations at specific point along the lightcurve (peak region and wings) of high magnification events are the most helpful in removing degeneracies. We also show that very small errors in the baseline magnitude can result in problems in measuring the blend fraction, and study the importance of non-Gaussian errors in the fit results. The biases and skewness in the distribution of the recovered blend fraction is discussed. We also find a new approximation formula relating the blend fraction and the unblended fit parameters to the underlying event duration needed to estimate microlensing optical depth.
Griest Kim
Thomas Christian L.
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