2001/02/02 by L. Eyer, P. R. Woźniak, P. R. Wozniak · 1 citation
Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Bulge #Galaxy #Gravitational lens #Light curve #Photometry (optics) #Physics #Proper motion #Stars #Stellar, planetary, and galactic studies #Variable star #Weak gravitational lensing #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2001.04753.x
published as Mon.Not.Roy.Astron.Soc. 327 (2001) 601 · for submission to MNRAS, latex, emulateapj, 10 pages (including 8 figures and table)
arxiv created 2001/02/02 · openalex publication_date 2001/10/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 Woźniak 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.