Zobrazeno 1 - 10
of 655
pro vyhledávání: '"Stepien, K."'
Autor:
Iwanek, P., Soszyński, I., Stępień, K., Kozłowski, S., Skowron, J., Udalski, A., Szymański, M. K., Wrona, M., Pietrukowicz, P., Poleski, R., Mróz, P., Ulaczyk, K., Skowron, D. M., Gromadzki, M., Rybicki, K., Mróz, M. J., Ratajczak, M.
Stellar rotation, a key factor influencing stellar structure and evolution, also drives magnetic activity, which is manifested as spots or flares on stellar surface. Here, we present a collection of 18 443 rotating variables located toward the Galact
Externí odkaz:
http://arxiv.org/abs/2406.18728
Autor:
Iwanek, P., Soszyński, I., Skowron, J., Udalski, A., Stępień, K., Kozłowski, S., Mróz, P., Poleski, R., Skowron, D., Szymański, M. K., Pietrukowicz, P., Ulaczyk, K., Wyrzykowski, Ł., Kruszyńska, K., Rybicki, K.
We present the discovery and statistical analysis of $12\;660$ spotted variable stars toward and inside the Galactic bulge from over two-decade-long Optical Gravitational Lensing Experiment (OGLE) data. We devise a new method of dereddening of indivi
Externí odkaz:
http://arxiv.org/abs/1903.05651
Autor:
Karczmarek, P., Wiktorowicz, G., Iłkiewicz, K., Smolec, R., Stępień, K., Pietrzyński, G., Gieren, W., Belczynski, K.
Single star evolution does not allow extremely low-mass stars to cross the classical instability strip (IS) during the Hubble time. However, within binary evolution framework low-mass stars can appear inside the IS once the mass transfer (MT) is take
Externí odkaz:
http://arxiv.org/abs/1612.00465
Publikováno v:
A&A 597, A87 (2017)
Context. Origin and evolution of blue stragglers in globular clusters is still a matter of debate. Aims. The aim of the present investigation is to reproduce the evolutionary history of four binary blue stragglers in four different clusters, for whic
Externí odkaz:
http://arxiv.org/abs/1610.02199
Autor:
Suchomska, K., Graczyk, D., Smolec, R., Pietrzyński, G., Gieren, W., Stȩpień, K., Konorski, P., Pilecki, B., Villanova, S., Thompson, I. B., Górski, M., Karczmarek, P., Wielgórski, P., Anderson, R. I.
We have analyzed the double-lined eclipsing binary system ASAS J180057-2333.8 from the All Sky Automated Survey (ASAS) catalogue . We measure absolute physical and orbital parameters for this system based on archival $V$-band and $I$-band ASAS photom
Externí odkaz:
http://arxiv.org/abs/1505.00766
Autor:
Soszynski, I., Stepien, K., Pilecki, B., Mroz, P., Udalski, A., Szymanski, M. K., Pietrzynski, G., Wyrzykowski, L., Ulaczyk, K., Poleski, R., Kozlowski, S., Pietrukowicz, P., Skowron, J., Pawlak, M.
We present a sample of 242 ultra-short-period (P < 0.22 d) eclipsing and ellipsoidal binary stars identified in the OGLE fields toward the Galactic bulge. Based on the light curve morphology, we divide the sample into candidates for contact binaries
Externí odkaz:
http://arxiv.org/abs/1503.02080
Autor:
Kiraga, M., Stepien, K.
Publikováno v:
Acta Astronomica 63, 53 (2013)
We present a catalog of 307 optical counterparts of the bright ROSAT X-ray sources, identified with the ASAS North survey data and showing periodic brightness variations. They all have declination north of -25 deg. Other data available from the liter
Externí odkaz:
http://arxiv.org/abs/1304.3236
Autor:
Smolec, R., Pietrzynski, G., Graczyk, D., Pilecki, B., Gieren, W., Thompson, I., Stepien, K., Karczmarek, P., Konorski, P., Gorski, M., Suchomska, K., Bono, G., Moroni, P. G. Prada, Nardetto, N.
Publikováno v:
MNRAS, 428, 3034 (2013)
We present non-linear hydrodynamic pulsation models for OGLE-BLG-RRLYR-02792 - a 0.26M_sun pulsator, component of the eclipsing binary system, analysed recently by Pietrzynski et al. The star's light and radial velocity curves mimic that of classical
Externí odkaz:
http://arxiv.org/abs/1210.6030
Autor:
Stepien, K., Gazeas, K.
Publikováno v:
AcA 62 (2012), 153
We present a study on low-mass contact binaries (LMCB) with orbital periods shorter than 0.3 days and total mass lower than about 1.4 solar mass. We show that such systems have a long pre-contact phase, which lasts for 8-9 Gyrs, while the contact pha
Externí odkaz:
http://arxiv.org/abs/1207.3929
Autor:
Pietrzynski, G., Thompson, I. B., Gieren, W., Graczyk, D., Stepien, K., Bono, G., Moroni, P. G. Prada, Pilecki, B., Udalski, A., Soszynski, I., Preston, G., Nardetto, N., McWilliam, A., Roederer, I., Gorski, M., Konorski, P., Storm, J.
Publikováno v:
Nature 484, 75-77 (05 April 2012)
RR Lyrae pulsating stars have been extensively used as tracers of old stellar populations for the purpose of determining the ages of galaxies, and as tools to measure distances to nearby galaxies. There was accordingly considerable interest when the
Externí odkaz:
http://arxiv.org/abs/1204.1872