115 citations · 1.7k across the 100 of their papers we have counts for
72 papers · 1 filter
The origin of dispersion in the wind mass-loss rate--luminosity relation of massive O stars
Jiri Krticka, Iva Krtickova
Stellar winds of hot stars are accelerated by the radiative force that mainly comes from the line transitions of heavy elements. As a result, the wind mass-loss rate is expected to…
Numerical modelling of recombination-driven stellar winds
Bestin James, Jiří Krtička
Low-temperature stars have a significant population of neutral hydrogen increasing with height in their atmospheres. This suggests eventual recombination as we move away from their…
New line-driven wind mass-loss rates for OB stars with metallicities down to
Jiri Krticka, Jiri Kubat, Iva Krtickova
We provide new line-driven wind models for OB stars with metallicities down to . The models were calculated with our global wind code METUJE, which solves the hydrod…
Unveiling stellar aurorae: Simulating auroral emission lines in hot stars induced by high-energy irradiation
Michal Kajan, Jiří Krtička, Jiří Kubát
Auroral emission lines result from the interaction between magnetic field and stellar wind, offering valuable insights into physical properties and processes occurring within magne…
The nature of medium-period variables on the extreme horizontal branch I. X-shooter study of variable stars in the globular cluster Cen
J. Krticka, I. Krtickova, C. Moni Bidin +6
A fraction of the extreme horizontal branch stars of globular clusters exhibit a periodic light variability that has been attributed to rotational modulation caused by surface spot…
Hot subdwarf wind models with accurate abundances II. Helium-dominated merger products CD-46 8926 and CD-51 11879
J. Krticka, I. Krtickova, J. Janik +3
We aim to understand the influence of evolutionary modified surface abundances on the strength of the stellar wind in the helium-dominated subdwarfs CD-46 8926 and CD-51 11879. We…
New mass-loss rates of Magellanic Cloud B supergiants from global wind models
J. Krticka, J. Kubat, I. Krtickova
We provide global models of line-driven winds of B supergiants for metallicities corresponding to the Large and Small Magellanic Clouds. The velocity and density structure of the m…
PM 1-322: new variable planetary nebula
E. Paunzen, K. Bernhard, J. Budaj +4
Spectra of planetary nebulae (PNe) are characterised by strong forbidden emission lines and often also by an infrared (IR) excess. A few PNe show dust obscuration events and/or har…
EPIC 206197016: A very hot white dwarf orbited by a strongly irradiated red dwarf
J. Krticka, A. Kawka, Z. Mikulasek +7
Very precise satellite photometry has revealed a large number of variable stars whose variability is caused either by surface spots or by binarity. Detailed studies of such variabl…
Progress towards a 3D Monte Carlo radiative transfer code for outflow wind modelling
Jakub Fišák, Jiří Kubát, Brankica Kubátová +2
Context: Radiative transfer modelling of expanding stellar envelopes is an important task in their analysis. To account for inhomogeneities and deviations from spherical symmetry,…
Analysis of photometric and spectroscopic variability of red supergiant Betelgeuse
Daniel Jadlovsky, Jiri Krticka, Ernst Paunzen +1
Betelgeuse is a pulsating red supergiant whose brightness is semi periodically variable and in February 2020 reached a historical minimum, the Great Dimming. The aims of this study…
HD 60431, the CP2 star with the shortest rotational period -- Physical parameters and period analysis
Z. Mikulasek, E. Semenko, E. Paunzen +5
CP2 stars show periodic photometric, spectroscopic, and magnetic variations with the rotational period. They are generally slow rotators, with rotational periods exceeding half a d…
Discovery and origin of the radio emission from the multiple stellar system KQVel
P. Leto, L. M. Oskinova, C. S. Buemi +20
KQVel is a binary system composed of a slowly rotating magnetic Ap star with a companion of unknown nature. In this paper, we report the detection of its radio emission. We conduct…
Photometric signatures of corotating magnetospheres of hot stars governed by higher-order magnetic multipoles
J. Krticka, Z. Mikulasek, P. Kurfurst +1
The light curves of magnetic, chemically peculiar stars typically show periodic variability due to surface spots that in most cases can be modeled by low-order harmonic expansion.…
Intrinsic polarization of Wolf-Rayet stars due to the rotational modulation of the stellar wind
S. Abdellaoui, J. Krtička, P. Kurfürst
Fast rotating Wolf-Rayet stars are expected to be progenitors of long duration gamma-ray bursts. However, the observational test of this model is problematic. Spectral lines of Wol…
A scaling relationship for non-thermal radio emission from ordered magnetospheres: from the top of the Main Sequence to planets
P. Leto, C. Trigilio, J. Krticka +20
In this paper, we present the analysis of incoherent non-thermal radio emission from a sample of hot magnetic stars, ranging from early-B to early-A spectral type. Spanning a wide…
Light variability of white dwarfs and subdwarfs due to surface abundance spots
J. Krticka, M. Prvak, I. Krtickova +2
Classical main-sequence chemically peculiar stars show light variability that originates in surface abundance spots. In the spots, the flux redistribution due to line (bound-bound)…
Stochastic light variations in hot stars from wind instability: Finding photometric signatures and testing against the TESS data
Jiri Krticka, Achim Feldmeier
Line-driven wind instability is expected to cause small-scale wind inhomogeneities, X-ray emission, and wind line profile variability. The instability can already develop around th…
New mass-loss rates of B supergiants from global wind models
Jiri Krticka, Jiri Kubat, Iva Krtickova
Massive stars lose a significant fraction of mass during their evolution. However, the corresponding mass-loss rates are rather uncertain. To improve this, we calculated global lin…
The auroral radio emission of the magnetic B-type star rho OphC
P. Leto, C. Trigilio, C. S. Buemi +19
The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multi-wavelength (1.6-16.7 GHz) ATCA measurements of the early-type…
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,…
Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
J. Krticka, A. Kawka, Z. Mikulasek +6
Ultraprecise space photometry enables us to reveal light variability even in stars that were previously deemed constant. A large group of such stars show variations that may be rot…
Stellar wind models of central stars of planetary nebulae
J. Krticka, J. Kubat, I. Krtickova
Fast line-driven stellar winds play an important role in the evolution of planetary nebulae. We provide global hot star wind models of central stars of planetary nebulae. The model…
Evidence for radio and X-ray auroral emissions from the magnetic B-type star rho Oph A
P. Leto, C. Trigilio, F. Leone +20
We present new ATCA multi-wavelength radio measurements (range 2.1-21.2 GHz) of the early-type magnetic star rho Oph A, performed in March 2019 during 3 different observing session…