Blazhko Effect in Double Mode Cepheids (2008)
Moskalik, P., Kolaczkowski, Z.
Systematic survey for multiperiodicity in the LMC Cepheids (Moskalik, Kolaczkowski & Mizerski 2004, 2006) has led to discovery of several new forms of pulsational behaviour. One of them is periodic...
Nonradial Modes in Classical Cepheids (2008)
Moskalik, P., Kolaczkowski, Z.
Systematic search for multiperiodicity in the LMC Cepheids (Moskalik, Kolaczkowski & Mizerski 2004) has led to discovery of low amplitude nonradial modes in a substantial fraction of overtone...
The eclipsing LMC star OGLE05155332--6925581: a clue for Double Periodic Variables (2008)
Mennickent, R. E., Kolaczkowski, Z., Michalska, G., Pietrzy'nski, G., Gallardo, R., Cidale, L., ...
We investigate the nature of OGLE05155332-6925581, one of the brightest members of the enigmatic group of Double Periodic Variables (DPVs) recently found in the Magellanic Clouds. The modeling of...
Two Be stars in the Small Magellanic Cloud with B[e]-like properties (2008)
Mennickent, R. E., Smith, M., Kolaczkowski, Z.
We present an analysis of UVES and MIKE (ground based) high resolution and Far Ultraviolet Spectroscopic Explorer spectra of two novel and photometrically variable bright blue stars in the SMC;...
A Catalogue of Be Stars in the Direction of the Galactic Bulge (2007)
Sabogal, B. E., Mennickent, R. E., Pietrzyński, G., García, J. A., Gieren, W., Kolaczkowski, Z., ...
Detailed studies of Be stars in environments with different metallicities like the Magellanic Clouds or the Galactic bulge are necessary to understand the formation and evolution mechanisms of the...
Double Mode Cepheids with Amplitude Modulation (2005)
Moskalik, P., Kolaczkowski, Z., Mizerski, T.
Recent search for multiperiodicity in LMC Cepheids (Moskalik, Kolaczkowski & Mizerski 2004) has led to discovery of periodic modulation of amplitudes and phases in many of the first/second overtone...
Beta Cephei stars in the inner part of the Galaxy (2005)
Narwid, A., Kolaczkowski, Z., Pigulski, A., Ramza, T.
From the Fourier analysis of the catalogue of ~200,000 variable candidates in the OGLE-II Galactic fields, we found a sample of about 230 short-period low-amplitude variable stars. From their...
High-amplitude Delta Scuti stars in the Galactic bulge from the OGLE-II and MACHO data (2005)
Pigulski, A., Kolaczkowski, Z., Ramza, T., Narwid, A.
Searching for main-sequence pulsators, we analyzed photometry of ~200,000 variable star candidates from the OGLE-II Galactic fields, finding 193 high-amplitude Delta Scuti stars. This doubles the...
Beta Cephei and SPB stars in the Large Magellanic Cloud (2003)
Kolaczkowski, Z., Pigulski, A., Soszynski, I., Udalski, A., Szymanski, M., Kubiak, M., ...
This is a progress report of the study of pulsating main-sequence stars in the LMC. Using the OGLE-II photometry supplemented by the MACHO photometry, we find 64 Beta Cephei stars in the LMC. Their...
Pigulski, A., Kolaczkowski, Z., Kopacki, G.
As a result of the reanalysis of the OGLE-I observations by means of the image subtraction method, we present the first part of a catalog, consisting of the data for variable stars in four Galactic...
Variable stars in the globular cluster M13 (2002)
Kopacki, G., Kolaczkowski, Z., Pigulski, A.
Results of a search for variable stars in the central region of the globular cluster M13 are presented. Prior to this study, 36 variable and suspected variable stars were known in this cluster...
Early-type variables in the Magellanic Clouds. I. Beta Cephei stars in the LMC bar (2002)
Pigulski, A., Kolaczkowski, Z.
A thorough analysis of the OGLE-II time-series photometry of the Large Magellanic Cloud bar supplemented by similar data from the MACHO database led us to the discovery of three Beta Cephei-type...