1k citations · 17.6k across the 313 of their papers we have counts for
18 papers · 1 filter
The OGLE View of Microlensing towards the Magellanic Clouds. III. Ruling out sub-solar MACHOs with the OGLE-III LMC data
L. Wyrzykowski, S. Kozlowski, J. Skowron +8
In the third part of the series presenting the Optical Gravitational Lensing Experiment (OGLE) microlensing studies of the dark matter halo compact objects (MACHOs) we describe res…
Accurate dynamical mass determination of a classical Cepheid in an eclipsing binary system
G. Pietrzynski, I. B. Thompson, W. Gieren +5
Stellar pulsation theory provides a means of determining the masses of pulsating classical Cepheid supergiant - it is the pulsation that causes their luminosity to vary. Such pulsa…
V1309 Scorpii: merger of a contact binary
R. Tylenda, M. Hajduk, T. Kamiński +8
Stellar mergers are expected to take place in numerous circumstences in the evolution of stellar systems. In particular, they are considered as a plausible origin of stellar erupti…
Binary Lenses in OGLE-III EWS Database. Seasons 2006--2008
M. Jaroszynski, J. Skowron, A. Udalski +7
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. Ou…
Variability of Young Massive Stars in the Arches Cluster
K. Markakis, A. Z. Bonanos, G. Pietrzynski +2
We present preliminary results of the first near-infrared variability study of the Arches cluster, using adaptive optics data from NIRI/Gemini and NACO/VLT. The goal is to discover…
OGLE-2009-BLG-092/MOA-2009-BLG-137: A Dramatic Repeating Event With the Second Perturbation Predicted by Real-Time Analysis
Y. -H. Ryu, C. Han, K. -H. Hwang +105
We report the result of the analysis of a dramatic repeating gravitational microlensing event OGLE-2009-BLG-092/MOA-2009-BLG-137, for which the light curve is characterized by two…
OGLE-2005-BLG-153: Microlensing Discovery and Characterization of A Very Low Mass Binary
K. -H. Hwang, A. Udalski, C. Han +77
The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly kn…
The Araucaria Project. First Cepheid Distance to the Sculptor Group Galaxy NGC 7793 from Variables discovered in a Wide-Field Imaging Survey
G. Pietrzynski, W. Gieren, M. Hamuy +12
We have detected, for the first time, Cepheid variables in the Sculptor Group spiral galaxy NGC 7793. From wide-field images obtained in the optical V and I bands on 56 nights in 2…
The Araucaria Project. Population effects on the V and I band magnitudes of red clump stars
G. Pietrzynski, M. Gorski, W. Gieren +3
We present measurements of the V and I band magnitudes of red clump stars in 15 nearby galaxies obtained from recently published homogenous HST photometry. Supplementing these resu…
The Araucaria Project: The distance to the Small Magellanic Cloud from near infrared photometry of Type~II Cepheids
Ciechanowska A., Pietrzynski G., Szewczyk O. +2
We have obtained deep near infrared J- and K-band observations of 14 BL Herculis and 5 W Virginis SMC stars from the OGLE III survey with the ESO New Technology Telescope equipped…
New R Coronae Borealis stars discovered in OGLE-III Galactic Bulge fields from their mid- and near- infrared properties
P. Tisserand, L. Wyrzykowski, P. R. Wood +8
An R Coronae Borealis (RCB) star is a rare type of supergiant star that is increasingly thought to be the evolved merger product of two white dwarfs. Recently, many of them have be…
OGLE 2008--BLG--290: An accurate measurement of the limb darkening of a Galactic Bulge K Giant spatially resolved by microlensing
P. Fouque, D. Heyrovsky, S. Dong +115
Gravitational microlensing is not only a successful tool for discovering distant exoplanets, but it also enables characterization of the lens and source stars involved in the lensi…
The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. VIII. Type II Cepheids in the Small Magellanic Cloud
I. Soszynski, A. Udalski, M. K. Szymanski +5
The eighth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) contains type II Cepheids in the Small Magellanic Cloud (SMC). The sample consists of 43 objects, including 17…
The OGLE View of Microlensing towards the Magellanic Clouds. II. OGLE-II SMC data
L. Wyrzykowski, S. Kozlowski, J. Skowron +8
The primary goal of this paper is to provide the evidence that can either prove or falsify the hypothesis that dark matter in the Galactic halo can clump into stellar-mass compact…
Photometry of two unusual A supergiant systems in the Small Magellanic Cloud
R. E. Mennickent, M. Smith, Z. Kołaczkowski +2
We present multiwavelength broadband photometry and V, I time resolved photometry for two variable bright stars in the SMC, OGLE004336.91-732637.7 (SMC-SC3) and OGLE004633.76-73120…
The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. VI. Delta Scuti Stars in the Large Magellanic Cloud
R. Poleski, I. Soszyński, A. Udalski +6
The sixth part of the OGLE-III catalog of Variable Stars presents δSct pulsators in the Large Magellanic Cloud. Altogether 2786 variable stars were found and amongst them 92 are mu…
The Optical Gravitational Lensing Experiment. The OGLE-III Catalog of Variable Stars. VII. Classical Cepheids in the Small Magellanic Cloud
I. Soszynski, R. Poleski, A. Udalski +6
The seventh part of the OGLE-III Catalog of Variable Stars (OIII-CVS) consists of 4630 classical Cepheids in the Small Magellanic Cloud (SMC). The sample includes 2626 fundamental-…
A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
T. Sumi, D. P. Bennett, I. A. Bond +104
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q=[9.5 +/- 2.1] x 10^{-5} via gravitational microlensing. The planetary devia…