223 citations · 657 across the 40 of their papers we have counts for
41 papers · 1 filter
Asteroseismology of the multiperiodic field SX Phe pulsator BL Camelopardalis
W. Szewczuk, J. Daszyńska-Daszkiewicz, P. Walczak +1
BL Camelopardalis (BL Cam) is the most metal-poor SX Phoenicis star known in the Galactic field, making it an excellent test bed for studies of Population II stellar structure and…
Asteroseismic analysis of RY Leporis: the post-main sequence HADS in a binary system
Wojciech Niewiadomski, Jadwiga Daszyńska-Daszkiewicz, Przemysław Walczak +4
We present a comprehensive study of the pulsating primary component of the long-period binary system RY Lep. The spectral energy distribution and the absence of detectable lines in…
Asteroseismology of blue stragglers in Centauri: the case of five double-mode radial SX Phoenicis pulsators
J. Daszyńska-Daszkiewicz, P. Walczak, P. Góra +1
We present the first extensive seismic modelling of SX Phe stars in the stellar system Cen. First, using the new values of reddening and distance modulus , an…
Asteroseismology of the fast-rotating high-amplitude Scuti star V2367 Cygni
Jadwiga Daszynska-Daszkiewicz, Wojciech Szewczuk, Przemysław Walczak
We present the comprehensive analysis of the high-amplitude Sct star V2367 Cygni. Firstly, we perform the frequency analysis for the whole available set of the {\it Kepler} and…
Asteroseismology of double-mode radial Scuti stars: AE Ursae Majoris and RV Arietis
J. Daszynska-Daszkiewicz, P. Walczak, W. Szewczuk +1
We construct complex seismic models of two high-amplitude delta Sct stars, AE UMa and RV Ari, each pulsating in two radial modes: fundamental and first overtone. The models reprodu…
A need to revise stellar opacities from asteroseismology of Scuti stars
Jadwiga Daszyńska-Daszkiewicz, Przemysław Walczak, Alexey Pamyatnykh +2
We construct seismic models of the four double-mode radial Scuti stars adopting opacities from three databases: OPAL, OP and OPLIB. The aim is to find the models that fit the o…
Asteroseismology of the double-radial mode Scuti star BP Pegasi
Jadwiga Daszyńska-Daszkiewicz, P. Walczak, A. A. Pamyatnykh +1
Using the ASAS data, we determine the pulsational frequencies of the high-amplitude Sct star BP Pegasi. The analysis revealed only the two known, independent frequencies. On th…
Seismic modeling of a very young SPB star -- KIC8264293
Wojciech Szewczuk, Przemysław Walczak, Jadwiga Daszyńska-Daszkiewicz +1
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 we…
Mode identification and seismic study of Scuti, the prototype of a class of pulsating stars
Jadwiga Daszynska-Daszkiewicz, A. A. Pamyatnykh, P. Walczak +3
We present a seismic study of Scuti based on a mode identification from multicoulor photometry. The dominant frequency can be associated only with a radial mode and the second…
Variability of newly identified B-type stars observed by Kepler
Wojciech Szewczuk, Przemysław Walczak, Jadwiga Daszyńska-Daszkiewicz
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.…
Seismic analysis of the double-mode radial pulsator SX Phoenicis
Jadwiga Daszyńska-Daszkiewicz, A. A. Pamyatnykh, P. Walczak +1
We present the results of complex seismic analysis of the prototype star SX Phoenicis. This analysis consists of a simultaneous fitting of the two radial-mode frequencies, the corr…
Rotational modulation and single g-mode pulsation in the B9pSi star HD174356?
Z. Mikulasek, E. Paunzen, S. Huemmerich +19
Chemically peculiar (CP) stars of the upper main sequence are characterised by specific anomalies in the photospheric abundances of some chemical elements. The group of CP2 stars,…
The Pulsation Properties of Bootis Stars I. The Southern TESS Sample
S. J. Murphy, E. Paunzen, T. R. Bedding +2
We analyse TESS light curves for 70 southern Boo stars to identify binaries and to determine which of them pulsate as Scuti stars. We find two heartbeat stars and two eclip…
Testing stellar opacities using asteroseismology
Jadwiga Daszynska-Daszkiewicz, Przemyslaw Walczak, Alosha Pamyatnykh +1
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 comple…
Complex asteroseismology of SX Phoenicis
J. Daszyńska-Daszkiewicz, P. Walczak, A. Pamyatnykh +2
We present seismic analysis of the prototype SX Phoenicis that aims at fitting the two radial-mode frequencies and the corresponding values of the bolometric flux amplitude (the pa…
Ensemble asteroseismology of pulsating B-type stars in NGC 6910
D. Moździerski, A. Pigulski, Z. Kołaczkowski +24
Asteroseismology offers the possibility of probing stellar interiors and testing evolutionary and seismic models. Precise photometry and spectroscopy obtained during multi-site cam…
A revisit to the enigmatic variable star 21 Comae
Ernst Paunzen, Gerald Handler, Przemyslaw Walczak +12
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 conc…
Seismic modelling of early B-type pulsators observed by BRITE: I. Ophiuchi
Przemysław Walczak, Jadwiga Daszyńska-Daszkiewicz, Andrzej Pigulski +8
We analyse time-series observations from the BRITE-Constellation of the well known Cephei type star Ophiuchi. Seven previously known frequencies were confirmed and nineteen…
What have we learnt from pulsations of B-type stars?
Jadwiga Daszynska-Daszkiewicz, Przemysław Walczak, Wojciech Szewczuk +1
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 constraint…
A Spectroscopic and Photometric Investigation of the Mercury-Manganese Star KIC 6128830
Stefan Hümmerich, Ewa Niemczura, Przemysław Walczak +4
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…
Inference for Stellar Opacities from Seismic Studies of the Hybrid Cep/SPB pulsators
Przemysław Walczak, Jadwiga Daszyńska-Daszkiewicz, Alexey Pamyatnykh
We present a comprehensive seismic study of the three pulsating stars of Cep/SPB type: Eridani, 12 Lacertae and Pegasi. Models with the modified mean opacity profile ar…
Interpretation of the BRITE oscillation spectra of the early B-type stars: Eri and Lup
Przemysław Walczak, Jadwiga Daszyńska-Daszkiewicz, Alexey Pamyatnykh +3
Eridani is a well known multiperiodic Cephei pulsator which exhibits also the SPB (Slowly Pulsating B-type stars) type modes. Recent frequency analysis of the BRITE photome…
Deciphering the period spacing pattern in the oscillation spectrum of the SPB star KIC 7760680
Wojciech Szewczuk, Jadwiga Daszyńska-Daszkiewicz, Przemysław Walczak
We present the analysis of KIC 7760680, the rotating Slowly Pulsating B-type star identified in the Kepler photometry. The oscillation spectrum of the star exhibits a series of 36…
The solitary g-mode frequencies in early B-type stars
J. Daszynska-Daszkiewicz, P. Walczak, A. A. Pamyatnykh +2
We present possible explanations of pulsations in early B-type main sequence stars which arise purely from the excitation of gravity modes. There are three stars with this type of…