Publications (53)
Cluster AgeS Experiment. Catalog of Variable Stars in the Globular Cluster Omega Centauri
J. Kaluzny, A. Olech, I. B. Thompson +3
We present results of a photometric survey for variable stars in the field of the globular cluster Omega Centauri. The observed region was centered roughly on the cluster core and…
Cluster AgeS Experiment: The Age and Distance of the Globular Cluster omega Centauri Determined from Observations of the Eclipsing Binary OGLEGC17
I. B. Thompson, J. Kaluzny, W. Pych +5
We use masses, radii, and luminosities of the detached eclipsing binary OGLEGC17 derived from photometric and spectroscopic observations to calculate the age and distance of the gl…
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster M12
J. Kaluzny, I. B. Thompson, W. Narloch +2
The field of the globular cluster M12 (NGC 6218) was monitored between 1995 and 2009 in a search for variable stars. light curves were obtained for 36 periodic or likely perio…
Metallicities and ages for star clusters and their surrounding fields in the Large Magellanic Cloud
W. Narloch, G. PietrzyÅski, W. Gieren +15
We study 147 star clusters in the Large Magellanic Cloud (LMC) in order to determine their mean metallicities and ages, as well as the mean metallicities of 80 surrounding fields.…
BVRI Observations of the Optical Afterglow of GRB 990510
K. Z. Stanek, P. M. Garnavich, J. Kaluzny +2
We present observations of the optical counterpart to the Gamma-Ray Burst (GRB) 990510 obtained with the Las Campanas 1.0-m telescope between 15 and 48 hours after the burst…
Cluster AgeS Experiment (CASE): Detection of a dwarf nova in the globular cluster M55
J. Kaluzny, P. Pietrukowicz, I. B. Thompson +4
We report the detection of a dwarf nova (DN) in the core region of the globular cluster M55. Six outbursts were observed during 8 observing seasons spanning the period 1997-2004. T…
RR Lyrae Variables in the Globular Cluster M5
J. Kaluzny, A. Olech, I. Thompson +3
We present V-band CCD photometry of 65 RR Lyr variables from the globular cluster M5. We have estimated the basic physical parameters for 16 RRc stars and 26 RRab stars using a Fou…
The Cluster AgeS Experiment (CASE). Detecting Photometric Variability with the Friends of Friends Algorithm
M. Rozyczka, W. Narloch, P. Pietrukowicz +2
We adapt the friends of friends algorithm to the analysis of light curves, and show that it can be successfully applied to searches for transient phenomena in large photometric dat…
Tracing dark energy with quasars
J. ÅredziÅska, B. Czerny, M. Bilicki +7
The nature of dark energy, driving the accelerated expansion of the Universe, is one of the most important issues in modern astrophysics. In order to understand this phenomenon, we…
The Clusters AgeS Experiment (CASE). IV. Analysis of the Eclipsing Binary V69 in the Globular Cluster 47 Tuc
I. B. Thompson, J. Kaluzny, S. M. Rucinski +4
We use photometric and spectroscopic observations of the eclipsing binary V69-47 Tuc to derive the masses, radii, and luminosities of the component stars. Based on measured systemi…
CCD Photometry of Dwarf Nova AL Com in Superoutburst
W. Pych, A. Olech
We report a CCD optical photometry of a dwarf nova AL Com in superoutburst. Before superhumps occurred the light curve was highly variable with dominant periods about 41 minutes an…
The Clusters AgeS Experiment (CASE): The blue straggler Star M55-V60 caught amidst rapid mass exchange
M. Rozyczka, J. Kaluzny, I. B. Thompson +3
We analyze light and velocity curves of the eclipsing blue straggler V60 in the field of the globular cluster M55. We derive Mp=1.259+-0.025 Msun, Rp=1.102+-0.021 Rsun, Mbol,p=3.03…
A search for dormant binaries with degenerate components in omega Centauri and NGC 6397
M. Rozyczka, J. Kaluzny, P. Pietrukowicz +4
We report on the first spectroscopic search for quiescent degenerate binaries in globular clusters. Our survey is based on a sample of short-period optical variables which are like…
The surface brightness - colour relations based on eclipsing binary stars and calibrated with Gaia EDR3
D. Graczyk, G. PietrzyÅski, C. GaÅan +23
The surface brightness -- colour relation (SBCR) is a basic tool in establishing precise and accurate distances within the Local Group. Detached eclipsing binary stars with accurat…
The Cluster AgeS Experiment (CASE). Variable stars in the field of the globular cluster M10
M. Rozyczka, W. Narloch, A. Schwarzenberg - Czerny +3
The field of the globular cluster M10 (NGC 6254) was monitored between 1998 and 2015 in a search for variable stars. V -light curves were derived for 40 variables or likely variabl…
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster NGC 6362
J. Kaluzny, I. B. Thompson, M. Rozyczka +2
The field of the globular cluster NGC 6362 was monitored between 1995 and 2009 in a search for variable stars. BV light curves were obtained for 69 periodic variables including 34…
Photometry and Spectroscopy of Eclipsing Binaries in omega Centauri
J. Kaluzny, I. Thompson, W. Krzeminski +3
Detached eclipsing double line spectroscopic binaries are accurate distance indicators. They can be used for the direct determination of distances to globular clusters in which suc…
Finding the elusive RR Lyrae companions via speckle imaging
R. Salinas, V. Kalari, G. Hajdu +25
Despite their key role in astrophysics, the binary properties of RR Lyrae stars (RRL) remain almost completely unknown since only a single RRL is confirmed as belonging to a binary…
Clusters AgeS Experiment. RR Lyr Variables in the Globular Cluster NGC 6362
A. Olech, J. Kaluzny, I. B. Thompson +3
We present V and B-band CCD photometry of 35 RR Lyr stars in the southern hemisphere globular cluster NGC 6362. Fourier decomposition of the light curves was used to estimate the b…
The Clusters AgeS Experiment (CASE). VI. Analysis of two detached eclipsing binaries in the Globular Cluster M55
J. Kaluzny, I. B. Thompson, A. Dotter +4
We present an analysis of the detached eclipsing binaries V44 and V54 belonging to the globular cluster M55. For V54 we obtain the following absolute parameters: $M_p=0.726\pm 0.01…
Absolute properties of BG Ind - a bright F3 system just leaving the Main Sequence
M. Rozyczka, J. Kaluzny, W. Pych +5
We present photometric and spectroscopic analysis of the bright detached eclipsing binary BG Ind. The masses of the components are found to be 1.428 +- 0.008 and 1.293 +- 0.008 Msu…
A ground-based proper motion study of twelve nearby Globular Clusters
W. Narloch, J. Kaluzny, R. Poleski +3
We derive relative proper motions of stars in the fields of the globular clusters M12, NGC 6362, M4, M55, M22, NGC 6752, NGC 3201, M30, M10, NGC 362, M5, and 47 Tucanae based on da…
The Clusters AgeS Experiment (CASE). Variable stars in the field of the open cluster NGC 6253
J. Kaluzny, M. Rozyczka, W. Pych +1
The field of the metal-rich open cluster NGC 6253 has been surveyed in a search for variable stars. A total of 25 new variables were detected, 14 of which are bright stars with 13<…
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster NGC 3201
J. Kaluzny, M. Rozyczka, I. B. Thompson +4
The field of the globular cluster NGC 3201 was monitored between 1998 and 2009 in a search for variable stars. light curves were obtained for 152 periodic or likely periodic v…
Quasars as tracers of cosmic flows
J. Modzelewska, B. Czerny, M. Bilicki +6
Quasars, as the most luminous persistent sources in the Universe, have broad applications for cosmological studies. In particular, they can be employed to directly measure the expa…
Cluster AgeS Experiment (CASE): SX Phe stars from the globular cluster Omega Centauri
A. Olech, W. A. Dziembowski, A. A. Pamyatnykh +4
We present an analysis and interpretation of oscillation spectra for all 69 SX Phoenicis stars discovered in the field of the cluster. For most of the stars we have reliable absolu…
The cluster ages experiment (CASE). V. Analysis of three eclipsing binaries in the globular cluster M4
J. Kaluzny, I. B. Thompson, M. Rozyczka +6
We use photometric and spectroscopic observations of the eclipsing binaries V65, V66 and V69 in the field of the globular cluster M4 to derive masses, radii, and luminosities of th…
Discovery of 5 Minutes Sine-like Oscillations in the light curve of the Asteroid 1689 Floris-Jan
W. Pych
We present CCD photometry of the long period asteroid 1689 Floris-Jan. On the light curve from nights 1997.02.10/11 and 1997.02.11/12 we detected sine-like oscillations with the pe…
The Cluster Ages Experiment (CASE). VIII. Age and Distance of the Globular Cluster 47 Tuc from the Analysis of Two Detached Eclipsing Binaries
I. B. Thompson, A. Udalski, A. Dotter +20
We use photometric and spectroscopic observations of the eclipsing binary E32 in the globular cluster 47 Tuc to derive the masses, radii, and luminosities of the component stars. T…
Photometric study of the star cluster NGC 2155 in the Large Magellanic Cloud: age estimation and variable stars
M. Otulakowska, A. Olech, W. Pych +3
We present results of new photometry for the globular star cluster NGC 2155 in the Large Magellanic Cloud (LMC). Our I- and V-band observations were obtained with the 6.5-meter Mag…
RR Lyrae Variables in the Globular Cluster M55. The First Evidence for Non Radial Pulsations in RR Lyr Stars
A. Olech, J. Kaluzny, I. B. Thompson +3
We present the results of a photometric study of RR Lyrae variables in the field of the globular cluster M55. We have discovered nine new RR Lyrae stars, increasing the number of k…
RR Lyrae stars in NGC 6362
R. Smolec, P. Moskalik, J. Kaluzny +3
We present the analysis of the top-quality photometry of RR Lyrae stars in the globular cluster NGC 6362, gathered over 11 observing seasons by the CASE project. 16 stars are funda…
Cluster AgeS Experiment (CASE): Deficiency of observed dwarf novae in globular clusters
P. Pietrukowicz, J. Kaluzny, A. Schwarzenberg-Czerny +4
We present the results of a search for dwarf novae (DNe) in globular clusters (GCs). It is based on the largest available homogeneous sample of observations, in terms of the time s…
The Clusters AgeS Experiment (CASE). II. The Eclipsing Blue Straggler OGLEGC-228 in the Globular Cluster 47 Tuc
J. Kaluzny, I. B. Thompson, S. M. Rucinski +4
We use photometric and spectroscopic observations of the eclipsing binary OGLEGC-228 (V228) to derive the masses, radii, and luminosities of the component stars. Based on measured…
Eclipsing binaries in the open cluster NGC 2243 - II. Absolute properties of NV CMa
J. Kaluzny, W. Pych, S. M. Rucinski +1
We present echelle spectroscopic data for five eclipsing binary stars and two giant stars in the field of the open cluster NGC 2243. The average cluster velocity is determined to b…
The Clusters AgeS Experiment (CASE). Variable stars in the field of the globular cluster NGC 362
M. Rozyczka, I. B. Thompson, W. Narloch +2
The field of the globular cluster NGC 362 was monitored between 1997 and 2015 in a search for variable stars. BV light curves were obtained for 151 periodic or likely periodic vari…
SALT long-slit spectroscopy of LBQS 2113-4538: variability of the Mg II and Fe II component
K. Hryniewicz, B. Czerny, W. Pych +4
The Mg II line is of extreme importance in intermediate redshift quasars since it allows us to measure the black hole mass in these sources and to use these sources as probes of th…
New observations of the old magnetic nova GQ Muscae
W. Narloch, J. Kaluzny, W. Krzeminski +5
We report photometric observations of GQ Mus performed between 1992 and 2011. We find that the total amplitude of the orbital modulation of its brightness decreased from ~0.9 mag i…
The Cluster AgeS Experiment (CASE). Analysis of the Detached Eclipsing Binary V15 in the Metal-Rich Open Cluster NGC 6253
M. Rozyczka, J. Kaluzny, I. B. Thompson +3
We present the first detailed analysis of the detached eclipsing binary V15 in the super-metal rich open cluster NGC 6253. We obtain the following absolute parameters: M_p=1.303+-0…
A photometric survey for variable stars in the globular cluster M5
J. Kaluzny, I. Thompson, W. Krzeminski +1
We present the results of a photometric survey for variable stars in the nearby globular cluster M5. A 14.8x22.8 arcmin^2 field centered on the cluster was monitored for a total of…
A VIMOS spectroscopy of photometric variables and straggler candidates in omega Centauri
M. Rozyczka, J. Kaluzny, P. Pietrukowicz +3
We report a spectroscopic study of 19 photometric variables and 55 blue, yellow and red straggler candidates in the field of omega Centauri. We confirm the cluster membership of 18…
Metallicities and ages for 35 star clusters and their surrounding fields in the Small Magellanic Cloud
W. Narloch, G. PietrzyÅski, W. Gieren +13
In this work we study 35 stellar clusters in the Small Magellanic Cloud (SMC) in order to provide their mean metallicities and ages. We also provide mean metallicities of the field…
International observational campaigns of the last two eclipses in EE Cephei: 2003 and 2008/9
C. GaÅan, M. MikoÅajewski, T. Tomov +87
Two observational campaigns were carried out during the eclipses of EE Cep in 2003 and 2008/9 to verify whether the eclipsing body in the system is indeed a dark disk and to unders…
The Clusters AgeS Experiment (CASE): Variable Stars in the Globular Cluster 47 Tucanae
J. Kaluzny, M. Rozyczka, W. Pych +3
Based on over 5400 BV images of 47 Tuc collected between 1998 and 2010 we obtained light curves of 65 variables, 21 of which are newly detected objects. New variables are located m…
SALT long-slit spectroscopy of CTS C30.10: two-component Mg II line
J. Modzelewska, B. Czerny, K. Hryniewicz +7
Quasars can be used as a complementary tool to SN Ia to probe the distribution of dark energy in the Universe by measuring the time delay of the emission line with respect to the c…
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…
Absolute parameters of AE For -- a highly active detached binary of late K type
M. Rozyczka, P. Pietrukowicz, J. Kaluzny +3
We present photometric and spectroscopic analysis of AE For -- a detached eclipsing binary composed of two late K dwarfs. The masses of the components are found to be 0.6314 +- 0.0…
Surface brightness-colour relations of dwarf stars from detached eclipsing binaries -- I. Calibrating sample
D. Graczyk, G. PietrzyÅski, C. Galan +19
Surface brightness -- colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophot…
CIR Modulation of the X-ray Flux from the O7.5 III(n)((f)) Star xi Persei?
D. Massa, L. Oskinova, A. W. Fullerton +5
We analyze a 162 ks HETG Chandra observation of the O7.5 III(n)((f)) star xi Per, together with contemporaneous H alpha observations. The X-ray spectrum of this star is similar to…
The Cluster AgeS Experiment (CASE). Variable stars in the field of the globular cluster M22
M. Rozyczka, I. B. Thompson, W. Pych +3
The field of the globular cluster M22 (NGC 6656) was monitored between 2000 and 2008 in a search for variable stars. light curves were obtained for 359 periodic, likely period…
The Clusters AgeS Experiment (CASE). I. V209 omega Cen - An Eclipsing Post-Common Envelope Binary in the Globular Cluster omega Cen
J. Kaluzny, S. M. Rucinski, I. B. Thompson +2
We use photometric and spectroscopic observations of the detached eclipsing binary V209 omega Cen to derive the masses, radii, and luminosities of the component stars. The system e…
A New Lower Main Sequence Eclipsing Binary with Detached Components
M. Rozyczka, J. Kaluzny, P. Pietrukowicz +4
We present an analysis of NGC2204-S892 -- a new detached eclipsing binary composed of two late K dwarfs. Based on three photometric campaigns launched in 2008 we obtained 5 light c…
Clusters AgeS Experiment. Hot subdwarfs and luminous white dwarf candidates in the field of the globular cluster M4
B. J. Mochejska, J. Kaluzny, I. Thompson +1
We present UBV color magnitude diagrams (CMDs) for the globular cluster M4. The CMDs show a sequence of four luminous blue stars (V<20, U-V<-0.6) which appear to be cluster hot sub…