Photometric detection of high proper motions in dense stellar fields using Difference Image Analysis

Details Photometric detection of high proper motions in dense stellar fields using Difference Image Analysis Photometric detection of high proper motions in dense stellar fields using Difference Image Analysis

2001-02-02

arxiv.org/abs/astro-ph/0102027v1

Mon.Not.Roy.Astron.Soc. 327 (2001) 601

Astronomy and Astrophysics

Astrophysics

for submission to MNRAS, latex, emulateapj, 10 pages (including 8 figures and table)

Scientific paper

10.1046/j.1365-8711.2001.04753.x

The Difference Image Analysis (DIA) of the images obtained by the Optical Gravitational Lensing Experiment (OGLE-II) revealed a peculiar artifact in the sample of stars proposed as variable by Wozniak (2000) 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 years. 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 (HPM stars) in very dense stellar fields, where conventional astrometric searches are extremely inefficient.

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