2001/10/16 by Tomasz Mizerski, M. Bejger, Mizerski, Tomasz +2
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0110375
24 pages, 19 figures, results can be obtained at ftp://ftp.astrouw.edu.pl/pub/mizerski/
arxiv created 2001/10/16 · openalex publication_date 2001/10/16 · arxiv updated 2009/12/01 · openalex created_date 2019/12/05 · openalex updated_date 2026/07/28
We present results of star variability analysis in OGLE II first bulge field.\nPhotometric database was derived by means of image subtraction method (Wozniak\n2000) and contains 4597 objects pre-classified as variables. We analyzed all\nthe light curves in order to find periodic variables, non periodic but all-time\nvariables and stars showing episodic changes in their brightness, e.g.\ngravitational lenses. Variability of 3969 stars was confirmed, among them we\ndetected 12 lensing event candidates whose light curves are shown. We found 762\nperiodic variables. Algorithmic methods let us identify 71 RR Lyrae and 110 W\nUMa stars. Almost all luminous red giants are found to be variable. Most of red\nclump giants are not variable. Classification of all 4597 objects is presented\nonline.\n