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Variable stars in the field of the old open cluster NGC 2243
Janusz Kaluzny, Wojciech Krzeminski, Beata Mazur
We report results of photometric monitoring of the NGC 2243 field in V and filters. Two W~UMa-type systems and three detached eclipsing binaries were discovered. Both contact s…
Modelling the Galactic Bar Using Red Clump Stars
K. Z. Stanek, M. Mateo, A. Udalski +4
The color-magnitude diagrams of stars obtained for 19 fields towards the Galactic bulge with the OGLE project reveal a well-defined population of bulge red clu…
The Optical Gravitational Lensing Experiment. Eclipsing Binaries and SX~Phe Stars in Omega~Cen and 47~Tuc
J. Kaluzny, M. Kubiak, M. Szymanski +3
Extensive monitoring of the central part of Omega Cen has lead to the discovery of 12 eclipsing binaries and 9 SX~Phe stars. We report also finding 6 contact binaries in the field…
Eclipsing Binaries in the Old Open Cluster NGC 2243
Janusz Kaluzny, Wojciech Krzeminski, Beata Mazur
We report discovery of two contact binaries and two detached eclipsing binaries in the central part of NGC 2243.
CCD PHOTOMETRY OF VARIABLE STARS IN THE GLOBULAR CLUSTER RU 106
Janusz Kaluzny, Wojciech Krzeminski, Beata Mazur
BV photometry is presented for 12 RR Lyr variables discovered in the presumably young galactic globular cluster Ruprecht 106. All variables are type RRab, and their periods span a…
THE OPTICAL GRAVITATIONAL LENSING EXPERIMENT. THE CATALOG OF PERIODIC VARIABLE STARS IN THE GALACTIC BULGE. II. PERIODIC VARIABLES IN FOUR BAADE'S WINDOW FIELDS: BW1, BW2, BW3 AND BW4
A. UDALSKI, M. SZYMANSKI, J. KALUZNY +3
We present the second part of the OGLE Catalog of Periodic Variable Stars in the Galactic bulge. 800 variable stars found in four Baade's Window fields BW1, BW2, BW3 and BW4 are pr…