Search results for: S. Kozłowski

Items from 1 to 20 out of 253 results

article

New Short-Period δ Scuti Stars in OGLE-IV Fields toward the Galactic Bulge

P. Pietrukowicz, M. Ratajczak, I. Soszyński, A. Udalski, more

Acta Astronomica > 2022 > Vol. 72, No. 3 > 161--170

We report the classification of 24 puzzling short-period variable stars located in OGLE-IV Galactic bulge fields. The stars are low-amplitude (<0.05 mag) multi-periodic objects with dominant periods between 22 min and 54 min whose type could not have been unambiguously established based on photometry only. A low-resolution spectroscopic follow-up observations have shown that all the objects are...

article

VP31.11: COVID‐19 pandemic‐related anxiety in pregnant women

U. Nowacka, S. Kozlowski, M. Januszewski, J. Sierdzinski, more

Ultrasound in Obstetrics & Gynecology > 58 > S1 > 228 - 228

article

A Survey Length for AGN Variability Studies

S. Kozłowski

Acta Astronomica > 2021 > Vol. 71, No. 2 > 103--112

The damped random walk (DRW) process is one of the most commonly used and simplest stochastic models to describe variability of active galactic nuclei (AGN). An AGN light curve can be converted to just two DRW model parameters - the signal decorrelation timescale τ and the asymptotic amplitude SF∞. In principle, these two model parameters may be correlated with the physical parameters of AGN. By simulation...

article

Over 24 000 δ Scuti Stars in the Galactic Bulge and Disk from the OGLE Survey

I. Soszyński, P. Pietrukowicz, J. Skowron, A. Udalski, more

Acta Astronomica > 2021 > Vol. 71, No. 3 > 189--204

We present the largest collection of δ Scuti-type stars in the Milky Way. Together with the recently published OGLE collection of δ Sct variables in the inner Galactic bulge, our sample consists of 24 488 objects distributed along the Milky Way plane, over galactic longitudes ranging from about -170° to +60°. The collection data include the I- and V-band time-series photometry collected since 1997...

article

VP37.18: Hepatic artery Doppler as a potential marker for fetal growth abnormalities

R. Brawura‐Biskupski‐Samaha, S. Kozlowski, M. Lipa, P. Kosinski, more

Ultrasound in Obstetrics & Gynecology > 56 > S1 > 221 - 221

article

Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV

P. Pietrukowicz, I. Soszyński, H. Netzel, M. Wrona, more

Acta Astronomica > 2020 > Vol. 70, No. 4 > 241--263

We present a collection of 10 111 genuine δ Sct-type pulsating variable stars detected in the OGLE-IV Galactic bulge fields. In this sample, 9835 variables are new discoveries. For most of the stars photometric data cover the whole decade 2010-2019. We illustrate a huge variety of light curve shapes of δ Sct variables. Long-term observations have allowed us to spot objects with evident period, amplitude,...

article

Additional Galactic Cepheids from the OGLE Survey

I. Soszyński, A. Udalski, M. K. Szymański, P. Pietrukowicz, more

Acta Astronomica > 2020 > Vol. 70, No. 2 > 101--119

We report on the results of a comprehensive search for Cepheid variable stars in the fields photometrically monitored by the OGLE Galaxy Variability Survey. We identify 742 Cepheids not included in the first release of the OGLE Collection of Galactic Cepheids and reclassify several dozen previously published variables. The upgraded collection comprises 1974 classical, 1625 type II, and 119 anomalous...

article

Properties of the Milky Way's Old Populations Based on Photometric Metallicities of the OGLE RR Lyrae Stars

P. Pietrukowicz, A. Udalski, I. Soszyński, D. M. Skowron, more

Acta Astronomica > 2020 > Vol. 70, No. 2 > 121--139

We have used photometric data on almost 91 000 fundamental-mode RR Lyr stars (type RRab) detected by the OGLE survey to investigate properties of old populations in the Milky Way. Based on their metallicity distributions, we demonstrate that the Galaxy is built from three distinct old components: halo, bulge, and disk. The distributions reach their maxima at approximately [Fe/H]_J95=-1.2 dex, -1.0...

article

Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey

I. Soszyński, A. Udalski, M. Wrona, M. K. Szymański, more

Acta Astronomica > 2019 > Vol. 69, No. 4 > 321--337

We present an upgrade of the OGLE Collection of RR Lyrae stars in the Galactic bulge and disk. The size of our sample has been doubled and reached 78 350 RR Lyr variables, of which 56 508 are fundamental-mode pulsators (RRab stars), 21 321 pulsate solely in the first-overtone (RRc stars), 458 are classical double-mode pulsators (RRd stars), and 63 are anomalous RRd variables (including six triple-mode...

article

Mapping the Northern Galactic Disk Warp with Classical Cepheids

D. M. Skowron, J. Skowron, P. Mróz, A. Udalski, more

Acta Astronomica > 2019 > Vol. 69, No. 4 > 305--320

We present an updated three dimensional map of the Milky Way based on a sample of 2431 classical Cepheid variable stars, supplemented with about 200 newly detected classical Cepheids from the OGLE survey. The new objects were discovered as a result of a dedicated observing campaign of the ≈280 square degree extension of the OGLE footprint of the Galactic disk during 2018-2019 observing seasons. These...

article

Final Release of the OGLE Collection of Cepheids and RR Lyrae Stars in the Magellanic System. The Outer Regions

I. Soszyński, A. Udalski, M. K. Szymański, P. Pietrukowicz, more

Acta Astronomica > 2019 > Vol. 69, No. 2 > 87--99

We present the final release of the OGLE collection of classical pulsators (Cepheids and RR Lyr stars) in the Large and Small Magellanic Clouds. The sky coverage has been increased from 670 to 765 square degrees compared to the previous edition of our collection. We also add some Cepheids and RR Lyr stars found by the Gaia team and reclassify three Cepheids. Ultimately, our collection consists of...

article

Genetic Inactivation of CD33 in Hematopoietic Stem Cells to Enable CAR T Cell Immunotherapy for Acute Myeloid Leukemia

Miriam Y. Kim, Kyung-Rok Yu, Saad S. Kenderian, Marco Ruella, more

Cell > 2018 > 173 > 6 > 1439-1453.e19

The absence of cancer-restricted surface markers is a major impediment to antigen-specific immunotherapy using chimeric antigen receptor (CAR) T cells. For example, targeting the canonical myeloid marker CD33 in acute myeloid leukemia (AML) results in toxicity from destruction of normal myeloid cells. We hypothesized that a leukemia-specific antigen could be created by deleting CD33 from normal hematopoietic...

article

Struktura mechaniczna i układ sterowania zrobotyzowanym montażem astronomicznym

K. Kozłowski, D. Pazderski, B. Krysiak, T. Jedwabny, more

Prace Naukowe Politechniki Warszawskiej. Elektronika > 2018 > z. 196 > 5--14

Praca przedstawia ogólny opis dotyczący projektowania zrobotyzowanego montażu teleskopu astronomicznego klasy 0,5 m. Scharakteryzowano strukturę mechaniczną i elektryczną urządzenia oraz jego elementy pomiarowe. Następnie przedstawiono algorytm sterowania osią wykorzystujący aktywną kompensację zakłócenia. Wyniki śledzenia trajektorii złącza obrotowego zbadano eksperymentalnie również w odniesieniu...

article

OGLE Collection of Galactic Cepheids

A. Udalski, I. Soszyński, P. Pietrukowicz, M. K. Szymański, more

Acta Astronomica > 2018 > Vol. 68, No. 4 > 315--339

We present here a new major part of the OGLE Collection of Variable Stars - OGLE Collection of Galactic Cepheids. The new dataset was extracted from the Galaxy Variability Survey images - a dedicated large-scale survey of the Galactic disk and outer bulge conducted by the OGLE project since 2013. The OGLE collection contains 2721 Cepheids of all types - classical, type II and anomalous. It more than...

article

Three-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?

P. Iwanek, I. Soszyński, D. Skowron, J. Skowron, more

Acta Astronomica > 2018 > Vol. 68, No. 3 > 213--236

The nature of type II Cepheids and anomalous Cepheids is still not well known and their evolutionary channels leave many unanswered questions. We use complete collection of classical pulsating stars in the Magellanic Clouds discovered by the OGLE project, to compare their spatial distributions, which are one of the characteristic features directly related to the star formation history. In this analysis...

article

OGLE-2017-BLG-1434Lb: Eighth q<1×10^-4Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function

A. Udalski, Y.-H. Ryu, S. Sajadian, A. Gould, more

Acta Astronomica > 2018 > Vol. 68, No. 1 > 1--42

We report the discovery of a cold Super-Earth planet (m_p=4.4±0.5 M⊕) orbiting a low-mass (M=0.23±0.03 M⊙) M dwarf at projected separation a_⊥=1.18±0.10 a.u., i.e., about 1.9 times the distance the snow line. The system is quite nearby for a microlensing planet, D_L=0.86±0.09 kpc. Indeed, it was the large lens-source relative parallax π_rel=1.0 mas (combined with the low mass M) that gave rise to the...

article

The OGLE Collection of Variable Stars. Type II Cepheids in the Magellanic System

I. Soszyński, A. Udalski, M. K. Szymański, Ł. Wyrzykowski, more

Acta Astronomica > 2018 > Vol. 68, No. 2 > 89--109

We present a nearly complete collection of type II Cepheids in the Magellanic System. The sample consists of 338 objects: 285 and 53 variables in the Large and Small Magellanic Clouds, respectively. Based on the pulsation periods and light-curve morphology, we classified 118 of our type II Cepheids as BL Her, 120 as W Vir, 34 as peculiar W Vir, and 66 as RV Tau stars. For all objects, we publish time-series...

article

OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy

J. Skowron, Y.-H. Ryu, K.-H. Hwang, A. Udalski, more

Acta Astronomica > 2018 > Vol. 68, No. 1 > 43--61

We report the discovery of microlensing planet OGLE-2017-BLG-0373Lb. We show that while the planet-host system has an unambiguous microlens topology, there are two geometries within this topology that fit the data equally well, which leads to a factor 2.5 difference in planet-host mass ratio, i.e., q=1.5×10^-3vs. q=0.6×10^-3. We show that this is an "accidental degeneracy" in the sense that...

article

Tiered analytics for purity assessment of macrocyclic peptides in drug discovery: Analytical consideration and method development

Jingfang (Jenny) Qian Cutrone, Xiaohua (Stella) Huang, Edward S. Kozlowski, Ye Bao, more

Journal of Pharmaceutical and Biomedical Analysis > 2017 > 138 > C > 166-174

Synthetic macrocyclic peptides with natural and unnatural amino acids have gained considerable attention from a number of pharmaceutical/biopharmaceutical companies in recent years as a promising approach to drug discovery, particularly for targets involving protein–protein or protein–peptide interactions. Analytical scientists charged with characterizing these leads face multiple challenges including...

article

OGLE Collection of Star Clusters. New Objects in the Magellanic Bridge and the Outskirts of the Small Magellanic Cloud

M. Sitek, M. K. Szymański, A. Udalski, D. M. Skowron, more

Acta Astronomica > 2017 > Vol. 67, No. 4 > 363--378

The Magellanic System (MS) encompasses the nearest neighbors of the Milky Way, the Large (LMC) and Small (SMC) Magellanic Clouds, and the Magellanic Bridge (MBR). This system contains a diverse sample of star clusters. Their parameters, such as the spatial distribution, chemical composition and age distribution yield important information about the formation scenario of the whole Magellanic System...

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INFONA - science communication portal

Search results for: S. Kozłowski

New Short-Period δ Scuti Stars in OGLE-IV Fields toward the Galactic Bulge

VP31.11: COVID‐19 pandemic‐related anxiety in pregnant women

A Survey Length for AGN Variability Studies

Over 24 000 δ Scuti Stars in the Galactic Bulge and Disk from the OGLE Survey

VP37.18: Hepatic artery Doppler as a potential marker for fetal growth abnormalities

Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV

Additional Galactic Cepheids from the OGLE Survey

Properties of the Milky Way's Old Populations Based on Photometric Metallicities of the OGLE RR Lyrae Stars

Over 78 000 RR Lyrae Stars in the Galactic Bulge and Disk from the OGLE Survey

Mapping the Northern Galactic Disk Warp with Classical Cepheids

Final Release of the OGLE Collection of Cepheids and RR Lyrae Stars in the Magellanic System. The Outer Regions

Genetic Inactivation of CD33 in Hematopoietic Stem Cells to Enable CAR T Cell Immunotherapy for Acute Myeloid Leukemia

Struktura mechaniczna i układ sterowania zrobotyzowanym montażem astronomicznym

OGLE Collection of Galactic Cepheids

Three-Dimensional Distributions of Type II Cepheids and Anomalous Cepheids in the Magellanic Clouds. Do these Stars Belong to the Old, Young or Intermediate-Age Population?

OGLE-2017-BLG-1434Lb: Eighth q<1×10^-4Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function

The OGLE Collection of Variable Stars. Type II Cepheids in the Magellanic System

OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy

Tiered analytics for purity assessment of macrocyclic peptides in drug discovery: Analytical consideration and method development

OGLE Collection of Star Clusters. New Objects in the Magellanic Bridge and the Outskirts of the Small Magellanic Cloud

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