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Astrometric Shifts in the OGLE-1 Microlensing Events
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Astrometric Shifts in the OGLE-1 Microlensing Events

David M Goldberg and Przemyslaw Wozniak
18 Dec 1997
url
https://doi.org/10.48550/arxiv.astro-ph/9712262View
Preprint (Author's original)arXiv.org - Non-exclusive license to distribute Open

Abstract

Physics - Astrophysics of Galaxies Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Instrumentation and Methods for Astrophysics Physics - Solar and Stellar Astrophysics
Acta Astron. 48 (1998) 19 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.

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