A5020311346- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Neutrino Physics Research
- Astronomical and nuclear sciences
- Pressure Ulcer Prevention and Management
- Spacecraft Design and Technology
- Adaptive optics and wavefront sensing
- Engineering and Test Systems
- Diagnosis and Treatment of Venous Diseases
- Wound Healing and Treatments
- Nosocomial Infections in ICU
- COVID-19 and healthcare impacts
- Health disparities and outcomes
- Geomagnetism and Paleomagnetism Studies
- SARS-CoV-2 detection and testing
- COVID-19 diagnosis using AI
University of Miskolc
2023-2024
Konkoly Observatory
2018-2024
Research Centre for Astronomy and Earth Sciences
2018-2024
MTA-SZTE Research Group on Artificial Intelligence
2022-2024
American Society for Radiation Oncology
2024
Czech Academy of Sciences, Institute of Physics
2024
Semmelweis University
2023-2024
Eötvös Loránd University
2014-2024
Pázmány Péter Catholic University
2024
Hungarian National Blood Transfusion Service
2023
We present new theoretical stellar yields and surface abundances for asymptotic giant branch (AGB) models with a metallicity appropriate stars in the Small Magellanic Cloud (SMC, Z = 0.0028, [Fe/H] ≈ −0.7). New evolutionary sequences post-processing nucleosynthesis results are presented initial masses between 1 7 M⊙, where M⊙ is super-AGB star an O–Ne core. Models above 1.15 become carbon rich during AGB, hot bottom burning begins M ≥ 3.75 M⊙. as function of thermal pulse number elements C...
Abstract Supernova (SN) 2018oh (ASASSN-18bt) is the first spectroscopically confirmed Type Ia supernova (SN Ia) observed in Kepler field. The data revealed an excess emission its early light curve, allowing us to place interesting constraints on progenitor system. Here we present extensive optical, ultraviolet, and near-infrared photometry, as well dense sampling of optical spectra, for this object. SN relatively normal photometric evolution, with a rise time 18.3 ± 0.3 days Δ m 15 ( B ) =...
Context . Since the discovery of first exoplanet almost three decades ago, number known exoplanets has increased dramatically. By beginning 2000s it was clear that dedicated facilities to advance our studies in this field were needed. The CHaracterising ExOPlanet Satellite (CHEOPS) is a space telescope specifically designed monitor transiting orbiting bright stars. In September 2023, CHEOPS completed its nominal mission duration 3.5 yr and remains excellent operational conditions. As...
The optical observations of Ic-4 supernova (SN) 2016coi/ASASSN-16fp, from $\sim 2$ to $\sim450$ days after explosion, are presented along with analysis its physical properties. SN shows the broad lines associated SNe Ic-3/4 but a key difference. early spectra display strong absorption feature at 5400$ \AA\ which is not seen in other SNe~Ic-3/4 this epoch. This has been attributed He I literature. Spectral modelling photospheric phase suggests presence residual C/O dominated shell. However,...
Abstract We present a photometric detection of the first brightness dips unique variable star KIC 8462852 since end Kepler space mission in 2013 May. Our regular surveillance started 2015 October, and sequence dipping began 2017 May continuing on through 2017, when was no longer visible from Earth. distinguish four main 1%–2.5% dips, named “ Elsie ,” Celeste Skara Brae Angkor which persist timescales several days to weeks. results so far are as follows: (i) there apparent changes stellar...
We present our photometric and spectroscopic observations on the peculiar transient AT2018cow. The multi-band photometry covers from peak to $\sim$70 days spectroscopy ranges 5 $\sim$50 days. rapid rise ($t_{\mathrm{r}}$$\lesssim$2.9 days), high luminosity ($M_{V,\mathrm{peak}}\sim-$20.8 mag) fast decline after make AT2018cow stand out of any other optical transients. While we find that its light curves show resemblance those type Ibn supernovae. Moreover, spectral energy distribution...
Barium (Ba) stars are polluted by material enriched in the slow neutron capture (s-process) elements synthesised interior of their former asymptotic giant branch (AGB) companion star, which is now a white dwarf. We compare individual Ba star abundance patterns to AGB nucleosynthesis models verify if model mass compatible with independently derived mass. selected sample 28 for both self-consistent spectroscopic observation and analysis available stellar determinations, via positioning on HR...
ABSTRACT Investigating period changes of classical Cepheids through the framework O − C diagrams provides a unique insight to evolution and nature these variable stars. In this work, new or extended for 148 Galactic are presented. By correlating calculated change rates with Gaia EDR3 colours, we obtain observational indications non-negligible dependence rate on horizontal position within instability strip. We find fluctuations in 59 confidence level 99 per cent, which distributed uniformly...
The COVID-19 pandemic necessitated wide-ranging adaptations to the organisation of health systems, and primary care is no exception. This article aims collate insights on role during pandemic. gained knowledge helps increase preparedness resilience.The in five European countries (Austria, Denmark, France, Hungary, Italy) was investigated using a qualitative approach, namely case study, based document analysis semi-structured interviews. In total, 31 interviews were conducted with providers...
Context. Barium (Ba) stars are characterised by an abundance of heavy elements made the slow neutron capture process ( s -process). This peculiar observed signature is due to mass transfer from a stellar companion, bound in binary system, Ba star today. The created when companion asymptotic giant branch (AGB) star. Aims. We aim analyse pattern 169 using machine learning techniques and AGB final surface abundances predicted F RUITY Monash models. Methods. developed algorithms that use as...
Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. aim to investigate exact nature eruptive phenomenon that star has been undergoing since 2018. Methods. used public-domain archival photometry characterise quiescent phase establish major physical parameters progenitor. our own optical infrared (IR) spectroscopy, along with data from public domain, study outburst. Results. Gaia20bdk is a member Sharpless 2-301...
Thermonuclear explosions of carbon-oxygen white dwarfs as Type Ia supernovae (SNe Ia) play a significant role in the galactic chemical evolution (GCE) Milky Way. However, long-standing and yet unresolved problem modern astrophysics concerns identity their progenitor. We aim to use GCE predictions help constrain potential SN progenitor scenarios, since it is well known that nucleosynthesis yields, particular Fe-peak elements, depend on explosion mechanism. calculated 1140 models compared...
Among the low-mass pre-main sequence stars, a small group called FU Orionis-type objects (FUors) are notable for undergoing powerful accretion outbursts. V1057 Cyg, classical example of an FUor, went into outburst around 1969-1970, after which it faded rapidly, making fastest fading FUor known. Around 1995, more rapid increase in occurred. Since that time, strong photometric modulations have been present. We present nearly 10 years source monitoring at Piszk\'estet\H{o} Observatory,...
Context . The modeling of stellar spectra flux standards observed by the Hubble and James Webb space telescopes requires a large synthetic spectral library that covers wide atmospheric parameter range. Aims aim this paper is to present describe calculation methods behind updated version BOSZ database, which was originally designed fit CALSPEC standards. These new local thermodynamic equilibrium (LTE) models incorporate both MARCS ATLAS9 model atmospheres, continuous opacities, 23 molecular...
The nearby SN 2017eaw is a Type II-P (``plateau') supernova showing early-time, moderate CSM interaction. We present comprehensive study of this including the analysis high-quality optical photometry and spectroscopy covering very early epochs up to nebular phase, as well near-UV near-infrared spectra, early-time X-ray radio data. combined data SNe 2004et allow us get an improved distance host galaxy, NGC 6946, $D \sim 6.85$ $\pm 0.63$ Mpc; fits in recent independent results on disfavors...
V582 Aur is an FU Ori-type young eruptive star in outburst since $\sim$1985. The eruption currently a relatively constant plateau phase, with photometric and spectroscopic variability superimposed. Here we will characterize the progenitor of outbursting object, explore its environment, analyse temporal evolution eruption. We are particularly interested physical origin two deep dips, one occurred 2012, ongoing 2016. collected archival photographic plates, carried out new optical, infrared,...
Historically, FU Orionis-type stars are low-mass, pre-main sequence stars. The members of this class experience powerful accretion outbursts and remain in an enhanced state for decades or centuries. V1515 Cyg, a classical FUor, started brightening the 1940s reached its peak brightness late 1970s. Following sudden decrease it stayed minimum few months, then several years. We present results our ground-based photometric monitoring complemented with optical/NIR spectroscopic monitoring. Our...
Context. Barium (Ba) stars are dwarf and giant enriched in elements heavier than iron produced by the slow neutron-capture process (s process). They belong to binary systems where primary star evolved through asymptotic branch (AGB) phase,during which it s-process transferred them onto secondary, now observed as a Ba star. Aims. We compare largest homogeneous set of observations Y, Zr, La, Ce, Nd with AGB nucleosynthesis models reach better understanding s stars. Methods. By considering...
Gaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several brightening events. We conducted monitoring observations using multi-filter optical and near-infrared photometry, as well spectroscopy, to understand physical properties investigate whether it fits into historically defined two classes. present analyses light curves, color variations, spectral lines, CO modeling. The curves show at least five events since 2015, evolutions are mostly gray. gray evolution...
In the last decade a number of rapidly evolving transients have been discovered that are not easily explained by traditional supernovae models. We present optical and UV data on onee such object, SN 2018gep, displayed fast rise with mostly featureless blue continuum around maximum light, evolved to develop broad features more typical Ic-bl while retaining significant amounts flux throughout its observations. The excess is most evident in near-UV over 4 magnitudes brighter than other stripped...
We present high-cadence ultraviolet (UV), optical, and near-infrared (NIR) data on the luminous Type II-P supernova SN 2017gmr from hours after discovery through first 180 days. does not show signs of narrow, high-ionization emission lines in early optical spectra, yet lightcurve evolution suggests that an extra energy source circumstellar medium (CSM) interaction must be for at least 2 days explosion. Modeling indicates a ~500R$_{\odot}$ progenitor radius, consistent with rather compact red...
We present the 30-min cadence Kepler/K2 light curve of Type Ia supernova (SN Ia) SN 2018agk, covering approximately one week before explosion, full rise phase and decline until 40 days after peak. additionally ground-based observations in multiple bands within same time range, including 1-day DECam first $\sim$5 light. The Kepler early is fully consistent with a single power-law rise, without evidence any bump feature. compare 2018agk sample other SNe~Ia excess flux from literature. find...
Context. Studying chromospheric activity of contact binaries is an effective way revealing the magnetic processes these systems. One efficient but somewhat neglected method for this purpose to follow changes H α line profiles via optical spectroscopy. Aims. Our goal perform a comprehensive preliminary analysis based on spectral signs largest sample date. Methods. We collected echelle spectra 12 bright in 17 nights. derived new radial velocity curves from our observations. For quantifying...
Abstract The Type Ia supernova (SN Ia) 2017cfd in IC 0511 (redshift ) was discovered by the Lick Observatory Supernova Search 1.6 ± 0.7 day after fitted first-light time (15.2 days before B -band maximum brightness). Photometric and spectroscopic follow-up observations show that SN is a typical, normal with peak luminosity mag, Δ m 15 ( = 1.16 reached ∼16.8 first light. We estimate there to be moderately strong host-galaxy extinction A V 0.39 0.03 mag) based on MLCS2k2 fitting. spectrum...
Context. Gaia18cjb is one of the Gaia -alerted eruptive young star candidates that has been experiencing a slow and strong brightening during last 13 years, similarly to some FU Orionis-type objects. Aims. The aim this work derive stellar nature determine its physical accretion properties classify variability. Methods. We conducted monitoring observations using multi-filter optical near-infrared (NIR) photometry, as well NIR spectroscopy. present an analysis pre-outburst outburst IR light...