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Astrometric Shifts in the OGLE-1 Microlensing Events

Goldberg D. M., Woźniak P. R.

Acta Astronomica

1998

Vol. 48, No. 1

19--34

We measure the astrometric shifts of the light centroids for the microlensing events in the OGLE-1 database. Of the 15 consistently detected events, 7 had significant shifts which we were able to measure with a fair degree of confidence. Those events with large shifts are also expected to be unresolved with a background "blend", and thus, we suggest that we have identified events in the OGLE-1 catalog which are strongly blended. Though we concentrate on the OGLE-1 database, and use the DOPHOT package in order to perform our analysis, we suggest that this shift is a generic effect, and should be observable in any crowded field.