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Boróka Hanga Pál (Szegedi Tudományegyetem)04/11/2026, 10:30
Massive stars can undergo substantial mass loss through several mechanisms, including nuclear flashes, pulsational pair instability (PPI), and convection waves depositing energy in the stellar envelope. Such mass-loss episodes are expected to create dense circumstellar environments that significantly affect the light curves of subsequent supernova explosions through ejecta–circumstellar...
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Dorottya Elekes (Eötvös University/Konkoly Observatory)04/11/2026, 10:45
We conducted photometric observations in multiple color bands (B , V, R) on selected target stars suspected of flare activity. The measurements were carried out using the 1 m RCC telescope of Konkoly Observatory. By comparing the light curves obtained through differential photometry in the three bands, we estimated the temperatures of the flares observed. Such temperature estimates derived...
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Zsófia Vig04/11/2026, 11:30
Supernova (SN) explosions are fundamental phenomena representing the final stages of stellar evolution, during which an enormous amount of energy is released over a short period of time. The radiation emitted during the explosion can interact with the circumstellar material (CSM), which can significantly affect the observed light curves (LCs) and spectra.
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A classic example of this... -
Zsuzsanna Dálya04/11/2026, 11:45
Stellar activity cycles are generally studied using observations spanning a decade or more. However, shorter time series may be sufficient to investigate activity-related variations in rapidly rotating F-type stars. The relationship between stellar rotation period and activity-cycle length is well established, but F-type stars occupy an intermediate position between the active and inactive...
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Marcell L. Kovács (HUN-REN CSFK Konkoly Observatory, Eötvös University Institute of Physics)04/11/2026, 12:00
The Transiting Exoplanet Survey Satellite (TESS) has accumulated an extensive photometric dataset for pulsating stars across the sky. Its scientific value for long-period pulsators depends strongly on the available time baseline. A single 27-day sector often covers only a fraction of a pulsation cycle, whereas stars in overlapping sectors may be monitored for several months, with coverage...
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Dániel Estók (ELTE, HUN-REN CSFK CSI)04/11/2026, 12:15
Young stellar objects (YSOs) show variability on very different time scales and with different amplitudes due to several physical mechanisms including changes in the mass accretion rate. Eruptive YSOs show variability on longer time scales (from several months to a year or from decades to a century) and with amplitudes up to 6 magnitudes. Studying these examples of episodic accretion is...
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Viktória Fröhlich (Universität Bern)06/11/2026, 11:00
Stars shed a large fraction of their mass during their lifetimes through dense stellar winds and supernova explosions. Because the gravitational potential that changes as this mass is lost, the orbits of planets, moons, and stellar companions can widen, become eccentric, or unbind entirely. Here, I present a series of studies that examine these consequences using variable-mass N-body...
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Nóra Varga (Eötvös Loránd University)06/11/2026, 11:15
The Transient High-Energy Sky and Early Universe Surveyor (THESEUS) will provide new opportunities for time-domain studies of young stellar objects through its soft X-ray, hard X-ray/γ-ray, and near-infrared capabilities. We investigate the potential of coordinated multi-wavelength observations of Galactic star-forming regions, with emphasis on X-ray flares, ultraviolet followup, and the most...
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Lívia Blanka Bárány (ELTE, HUN-REN CSFK CSI)06/11/2026, 11:30
Strange modes are unusual, non-classical pulsation behaviors that arise when the outer envelope of a Cepheid decouples from the interior. Mapping their expected instability regions based on stellar models is essential for the future observational identification of these objects. While prior research successfully established the theoretical instability strip of strange mode Cepheids on the...
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Erika Mochnács (University of Szeged)06/11/2026, 11:45
Type Ia supernovae are one of the most significant stellar explosions since they can be used for distance measurements in the universe. Among their subclasses, Type Iax supernovae show the highest diversity while being the lowest energy explosions of all Type Ia. Our aim is to study their origins and the possibility of expanding the distance ladder with them. One of the key steps of my work...
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Anna Görgei (HUN-REN CSFK, Konkoly Observatory)06/11/2026, 12:00
Magnetic activity in cool stars is closely linked to stellar rotation and dynamo processes. Open clusters offer a controlled environment for investigating stellar activity because their members share ages, distances, and chemical compositions. We investigate how stellar age and effective temperature influence flare activity in cool stars, and search for signatures of coronal mass ejections...
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Zsófia Bora (Hun-Ren CSFK KTM CSI)06/11/2026, 12:15
Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarfs in binary systems, and have been widely used for astronomical distance measurements for decades. Despite their long history of observation however, there are many unknowns about the physical parameters of the progenitor star and the explosion mechanism itself. One of these unknowns is the presence of so-called...
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