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The Light Curve Statistical Moments Analysis: The Identification of Eclipsing Binaries

Graczyk D., Eyer L.

Acta Astronomica

2010

Vol. 60, No. 2

109--119

A semi-automatic method of identifying eclipsing binaries in large photometric surveys, based on the analysis of the light curve statistical moments, is presented. This method was tested on the OGLE-II database of variable stars in the Large Magellanic Cloud. As a result 99.0% of eclipsing binaries in Wyrzykowski et al. (2003) catalog and 100% of eclipsing binaries in Groenewegen (2005) catalog were recovered. Additionally we identified 752 new eclipsing binaries in the LMC that were not presented in earlier catalogs thereby increasing detection rates by about 25%. The method is more focusing on detached and semi-detached eclipsing binaries. We conclude that this method is well suited for use in eclipsing binary searches of large surveys such as OGLE-III.

Search for QSO Candidates in OGLE-II Data

Eyer L.

Acta Astronomica

2002

Vol. 52, No. 3

241--262

A search for faint slowly variable objects was undertaken in the hope of finding QSO candidates behind the Small and Large Magellanic Clouds (SMC and LMC). This search used the optical variability properties of point sources from the Magellanic Cloud OGLE-II photometric data. Objects bluer than V-I=0.9 mag and within 17 mag < I <20.5 mag were studied. Robust variograms/structure functions have been computed for each time-series and only candidates showing a significantly increasing variability over longer time scales were selected. Several light curves were identified as having probable artifacts and were therefore removed. Stars showing signs of periodicity or small trends in their light curves were also removed and we are left with mostly either Be stars (γ Cas stars) or QSO candidates. We present a list of 25 slowly varying objects for SMC and 155 for LMC, out of 15 000 and 53 000 variable objects respectively. Of these, about 15 objects for the SMC and 118 objects for the LMC are QSO candidates.