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1
Content available remote Binary Lenses in OGLE-III EWS Database. Seasons 2006-2008
Jaroszyński M., Skowron J., Udalski A., Kubiak M., Szymański M. K., Pietrzyński G., Soszyński I., Wyrzykowski Ł., Ulaczyk K., Poleski R.
Acta Astronomica
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2010
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Vol. 60, No. 3
197--231
EN
We present 27 binary lens candidates from OGLE-III Early Warning System database for the seasons 2006-2008. The candidates have been selected by visual light curves inspection. Our sample of binary lens events consists now of 78 stellar systems and 7 extrasolar planets of OGLE-III published elsewhere. Examining the distribution of stellar binaries we find that the number of systems per logarithmic mass ratio interval increases with mass ratio q, in contradiction with our previous findings. Stellar binaries belong to the region 0.03
2
Content available remote Binary Lenses in OGLE III EWS Database. Season 2005
Skowron J., Jaroszyński M., Udalski A., Kubiak M., Szymański M. K., Pietrzyński G., Soszyński I., Szewczyk O., Wyrzykowski Ł., Ulaczyk K.
Acta Astronomica
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2007
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Vol. 57, No. 4
281--299
EN
We present nine new binary lens candidates from OGLE-III Early Warning System database for the season of 2005. We have also found four events interpreted as single mass lensing of double sources. The candidates have been selected by visual light curves inspection. Examining the models of binary lenses in our previous studies (10 caustic crossing events of OGLE-II seasons 1997-1999 and 34 binary lens events of OGLE-III seasons 2002-2004, including one planetary event), in this work and in three publications concerning planetary events of season 2005, we find four cases of extreme mass ratio binaries (q≤0.01), and almost all other models with mass ratios in the range 0.1
3
Content available remote A Study of Stellar Photometric Variability Within the Central 4 pc of the Galactic Center with Infrared Image Subtraction
Peeples M. S., Stanek K. Z., DePoy D. L.
Acta Astronomica
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2007
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Vol. 57, No. 2
173--199
EN
We present a catalog of 110 variable stars within ≈1' of Sgr A* based on image subtraction of near-infrared (H and K) photometry. Our images were obtained over 133 nights from 2000 to 2002 in H-band and over 134 nights from 2001 to 2002 in K-band; the typical FWHM is 1".4. We match the catalog to other near-infrared, X-ray, and radio (i.e., maser) data, and we discuss some of the more interesting objects. The catalog includes 14 sources with measurable periods, several known long-period variables and three new LPV candidates. We associate IRS 10* with OH, SiO, and H2O masers and a bright X-ray point source; this analysis suggests IRS 10* is an AGB star with an accreting companion. Among the ≈90 newly discovered sources are a probable cataclysmic variable, a potential edge-on contact 84 day period eclipsing binary, and a possible 41 day period pulsating variable.
4
Content available remote The Optical Gravitational Lensing Experiment. Variable Baseline Microlensing Events in the Galactic Bulge
Wyrzykowski Ł., Udalski A., Mao S., Kubiak M., Szymański M. K., Pietrzyński G., Soszyński I., Szewczyk O.
Acta Astronomica
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2006
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Vol. 56, No. 2
145--169
EN
We present the first systematic search for microlensing events with variability in their baselines using data from the third phase of the Optical Gravitational Lensing Experiment (OGLE-III). A total of 137 candidates (88 new) was discovered toward the Galactic bulge. Among these, 21 have periodic oscillations in their baselines, 111 are irregular variables and 5 are potential long period detached eclipsing binaries. This is about 10% of the total number of constant baseline events. They are hence quite common and can be regarded as a new type of exotic events, which allow the determination of extra parameters of the events. We show that microlensing of variable stars may allow us to break the degeneracy between the blending parameter and magnification. We note that in some cases variability hidden in the baseline due to strong blending may be revealed in highly magnified events and resemble other exotic microlensing behavior, including planetary deviation. A new system (VEWS) for detecting ongoing variable baseline microlensing events is presented.
5
Content available remote Binary Lenses in OGLE-III EWS Database. Season 2004
Jaroszyński M., Skowron J., Udalski A., Kubiak M., Szymański M. K., Pietrzyński G., Soszyński I., Żebruń K., Szewczyk O., Wyrzykowski Ł.
Acta Astronomica
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2006
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Vol. 56, No. 4
307--332
EN
We present 19 binary lens candidates from OGLE-III Early Warning System database for the season of 2004. We have also found five events interpreted as single mass lensing of double sources. The candidates have been selected by visual light curves inspection. Examining the models of binary lenses of this and our previous studies (10 caustic crossing events of OGLE-II seasons 1997-1999 and 15 binary lens events of OGLE-III seasons 2002-2003) we find one case of extreme mass ratio binary (q≈0.005, a known planetary lens OGLE 2003-BLG-235/MOA 2003-BLG-53) and almost all other models with mass ratios in the range 0.1
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