Automatic variability analysis of bulge stars in OGLE II image subtraction database

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dc.creatorMizerski, Tomasz
dc.creatorBejger, Michal
dc.date2001-10-16
dc.date.accessioned2026-07-07T02:00:52Z
dc.date.available2026-07-07T02:00:52Z
dc.descriptionWe present results of star variability analysis in OGLE II first bulge field. Photometric database was derived by means of image subtraction method (Wozniak 2000) and contains 4597 objects pre-classified as variables. We analyzed all the light curves in order to find periodic variables, non periodic but all-time variables and stars showing episodic changes in their brightness, e.g. gravitational lenses. Variability of 3969 stars was confirmed, among them we detected 12 lensing event candidates whose light curves are shown. We found 762 periodic variables. Algorithmic methods let us identify 71 RR Lyrae and 110 W UMa stars. Almost all luminous red giants are found to be variable. Most of red clump giants are not variable. Classification of all 4597 objects is presented online.
dc.description24 pages, 19 figures, results can be obtained at ftp://ftp.astrouw.edu.pl/pub/mizerski/
dc.identifierhttps://arxiv.org/abs/astro-ph/0110375
dc.identifierhttp://arxiv.org/abs/astro-ph/0110375
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3551
dc.subjectAstrophysics
dc.titleAutomatic variability analysis of bulge stars in OGLE II image subtraction database
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