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CURiuos Variables Experiment (CURVE): Variable Stars in the metal-poor Globular Cluster M56
P. Pietrukowicz, A. Olech, P. Kedzierski +3
We have surveyed a 6.5' x 6.5' field centered on the globular cluster M56 (NGC 6779) in search for variable stars. We have detected seven variables, among which two objects are new…
Cluster AgeS Experiment (CASE): Dwarf Novae and a Probable Microlensing Event in the Globular Cluster M22
P. Pietrukowicz, J. Kaluzny, I. B. Thompson +4
We report the identification of a new cataclysmic variable (denoted as CV2) and a probable microlensing event in the field of the globular cluster M22. Two outbursts were observed…
Variable Stars in the Archival HST Data of Globular Clusters M13, M30 and NGC 6712
Pawel Pietrukowicz, Janusz Kaluzny
We have analyzed archival HST/WFPC2 time-series data of the central parts of globular clusters M13, M30 and NGC 6712 in search of variable objects. Among a total of 21 identified v…
Searching for Variable Stars in the Central Part of the Globular Cluster M22
Pawel Pietrukowicz, Janusz Kaluzny
Time-series data taken with the Hubble Space Telescope of three fields covering the central part of the globular cluster M22 have been analyzed in search of variable objects. We re…
Period Changes in Galactic Classical Cepheids. Slow Evolution of Long-period Cepheids
Pawel Pietrukowicz
We compared period changes derived from O-C diagrams for 63 classical Cepheids from our Galaxy with model calculations. We found that for Cepheids with log P > 1.0 the observed cha…
Period Changes of the SMC Cepheids from the Harvard, OGLE and ASAS Data
Pawel Pietrukowicz
Comparison of the old observations of Cepheids in the Small Magellanic Cloud from the Harvard data archive, with the recent OGLE and ASAS observations allows an estimate of their p…