Photometric detection of high proper motions in dense stellar fields using difference image analysis |
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Authors: | L Eyer PR Woniak |
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Institution: | 1Princeton University Observatory, Princeton, NJ 08544, USA;2Los Alamos National Laboratory, MS-D436, Los Alamos, NM 87545, USA |
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Abstract: | The difference image analysis (DIA) of the images obtained by the Optical Gravitational Lensing Experiment (OGLE-II) revealed a peculiar artefact in the sample of stars proposed as variable by Wo?niak in one of the Galactic bulge fields: the occurrence of pairs of candidate variables showing anti-correlated light curves monotonic over a period of 3 yr. This effect can be understood, quantified and related to the stellar proper motions. DIA photometry supplemented with a simple model offers an effective and easy way to detect high proper motion stars in very dense stellar fields, where conventional astrometric searches are extremely inefficient. |
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Keywords: | methods: data analysis techniques: photometric astrometry stars: variables: other |
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