Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Walczak, Przemyslaw"'
We present the comprehensive analysis of the high-amplitude $\delta$ Sct star V2367 Cygni. Firstly, we perform the frequency analysis for the whole available set of the {\it Kepler} and {\it TESS} photometry. Most of the frequency peaks are harmonics
Externí odkaz:
http://arxiv.org/abs/2406.11060
Autor:
Daszyńska-Daszkiewicz, Jadwiga, Walczak, Przemysław, Pamyatnykh, Alexey, Szewczuk, Wojciech, Niewiadomski, Wojciech
We construct seismic models of the four double-mode radial $\delta$ Scuti stars adopting opacities from three databases: OPAL, OP and OPLIB. The aim is to find the models that fit the observed frequencies of the two radial modes and have the effectiv
Externí odkaz:
http://arxiv.org/abs/2212.14294
KIC8264293 is a fast rotating B-type pulsator observed by Kepler satellite. Its photometric variability is mainly due to pulsations in high-order g modes. Besides, we detected a weak H$\alpha$ emission. Thus, the second source of variability is the f
Externí odkaz:
http://arxiv.org/abs/2201.07039
Recent re-determination of stellar atmospheric parameters for a sample of stars observed during the {\it Kepler} mission allowed to enlarge the number of {\it Kepler} B-type stars. We present the detailed frequency analysis for all these objects. All
Externí odkaz:
http://arxiv.org/abs/2103.06146
We present what constraints on opacities can be derived from the analysis of stellar pulsations of BA-type main-sequence stars. This analysis consists of the construction of complex seismic models which reproduce the observed frequencies as well as t
Externí odkaz:
http://arxiv.org/abs/1912.00409
Autor:
Paunzen, Ernst, Handler, Gerald, Walczak, Przemyslaw, Huemmerich, Stefan, Niemczura, Ewa, Kallinger, Thomas, Weiss, Werner, Bernhard, Klaus, Fedurco, Miroslav, Guetl-Wallner, Anna, Matthews, Jaymie, Pribulla, Theodor, Vanko, Martin, Wallner, Stefan, Rozanski, Tomasz
The magnetic chemically peculiar (Ap/CP2) star 21 Com has been extensively studied in the past, albeit with widely differing and sometimes contradictory results, in particular concerning the occurrence of short term variability between about 5 to 90
Externí odkaz:
http://arxiv.org/abs/1904.04809
Autor:
Walczak, Przemysław, Daszyńska-Daszkiewicz, Jadwiga, Pigulski, Andrzej, Pamyatnykh, Alexey, Moffat, Anthony F. J., Handler, Gerald, Pablo, Herbert, Popowicz, Adam, Wade, Gregg, Weiss, Werner W., Zwintz, Konstanze
We analyse time-series observations from the BRITE-Constellation of the well known $\beta$ Cephei type star $\theta$ Ophiuchi. Seven previously known frequencies were confirmed and nineteen new frequency peaks were detected. In particular, high-order
Externí odkaz:
http://arxiv.org/abs/1903.04224
We review the main results obtained from our seismic studies of B-type main sequence pulsators, based on the ground-based, MOST, Kepler and BRITE observations. Important constraints on stellar opacities, convective overshooting and rotation are deriv
Externí odkaz:
http://arxiv.org/abs/1812.00075
Autor:
Hümmerich, Stefan, Niemczura, Ewa, Walczak, Przemysław, Paunzen, Ernst, Bernhard, Klaus, Murphy, Simon J., Drobek, Dominik
The advent of space-based photometry provides the opportunity for the first precise characterizations of variability in Mercury-Manganese (HgMn/CP3) stars, which might advance our understanding of their internal structure. We have carried out a spect
Externí odkaz:
http://arxiv.org/abs/1711.08519
We present a comprehensive seismic study of the three pulsating stars of $\beta$ Cep/SPB type: $\nu$ Eridani, 12 Lacertae and $\gamma$ Pegasi. Models with the modified mean opacity profile are constructed in order to account for both the observed fre
Externí odkaz:
http://arxiv.org/abs/1704.06067