Conveners
S02 Astronomy and Astrophysics
- Predrag Jovanovic (Astronomical Observatory Belgrade)
S02 Astronomy and Astrophysics
- Dejan Urošević
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Marko Krco (National Astronomical Observatories, Chinese Academy of Science)30/08/2022, 14:00S02 Astronomy and AstrophysicsInvited talk (virtual)
The Commensal Radio Astronomy FAST Telescope Survey (CRAFTS) is underway. With over 2,000 hours complete (out of 11,000 planned) we have mapped significant sections of the sky visible from the Five Hundred Meter Spherical Aperture Telescope (FAST) located in Guizhou, China. The Survey itself represents a technological leap forward in radio telescope observation techniques which allows for...
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Elena Vchkova Bebekovska (Institute of Physics, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius, University in Skopje)30/08/2022, 14:30S02 Astronomy and AstrophysicsOral presentation
In the last two decades, part of the observational time at Bulgarian National Astronomical Observatory (BNAO) Rozhen was dedicated to asteroid observations. Even though we had limited time, we collected enough information to proceed with differential photometry on many asteroids. Using a combination of lightcurves of an asteroid, gained from observations at several oppositions, we were able to...
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Evgeni Semkov (Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences)30/08/2022, 14:45S02 Astronomy and AstrophysicsOral presentation
Bulgarian National Astronomical Observatory Rozhen is located in the Rhodope Mountains at about 1750 m above sea level. The astronomical observatory is the biggest one-time Bulgarian investment in scientific infrastructure and a leading astronomical center in the South-East Europe. So far, the observatory has four telescopes: 2-m RCC multipurpose telescope equipped with four new professional...
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Yovelina Zinkova (Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences)30/08/2022, 15:00S02 Astronomy and AstrophysicsOral presentation
Polarization is a property of light widely used as a source of additional information in astronomy. The primary source of polarization in the atmosphere is the scattering by gas molecules although meteorological conditions, sky pattern, underlying surface reflectance, etc. may influence the observed sky polarization. In order to explicate polarization measurements correctly, it is important to...
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Grozdan Shirov (Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences)30/08/2022, 15:15S02 Astronomy and AstrophysicsOral presentation
One of the current problems of our contemporary time is related to changes in the climate of local, as well as global scope. We offer an analysis of long-term time series of meteorological data from different weather stations in Bulgaria. The main portion of the analyzed data are monthly average values of temperature, precipitation, atmospheric pressure, and they can be related to different...
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Bojan Arbutina (Department of Astronomy, Faculty of Mathematics, University of Belgrade)30/08/2022, 16:30S02 Astronomy and AstrophysicsInvited talk
A well-known paradigm about the origin of Galactic cosmic rays (CRs) is that these high-energy particles are accelerated in the process of diffusive shock acceleration (DSA) at collisionless shocks (at least up to the so-called “knee” energy of $10^{15}$ eV). Knowing the details of injection of electrons, protons and heavier nuclei into the DSA, their initial and the resulting spectrum, is...
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Daniela Kirilova (Institute of Astronomy and NAO, Bulgarian Academy if Sciences)30/08/2022, 17:00S02 Astronomy and AstrophysicsOral presentation (virtual)
Big Bang Nucleosynthesis (BBN) is one of the most reliable tests of Beyond Standard Model (BSM) physics due to the remarkable concordance between the theoretically predicted and the derived from observations abundances of light elements produced primordially. Recently the primordial light elements D and He-4 were determined with higher accuracy. This allows to update and strengthen the Big...
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Enkelejd Çaça (Departament of Physics, Faculty of Mathematical Engineering and Physical Engineering, Polytechnic Universit of Tirana)30/08/2022, 17:15S02 Astronomy and AstrophysicsOral presentation (virtual)
S-Z is an effect, which consists in the inverse Compton effect of the hot electronic gas interacting with Cosmic Microwave Background (CMB) photons passing through Intra Cluster Medium (ICM). Building more accurate profiles for temperature and density of hot electronic gas, concentrated in the center of clusters of galaxies, is a constant problem in survey of Sunyeav Zel’dovich effect (SZ)....
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Dr Antoniya Valcheva (Department of Astronomy, Sofia University "St. Kliment Ohridski", Bulgaria)30/08/2022, 17:30S02 Astronomy and AstrophysicsOral presentation
We report BR-bands monitoring of 6 massive star candidates selected in a 10x10 sq. arcmin field in north-east quarter of the IC342 galaxy on the base of our B+H$\alpha$ images obtained with the 2m RCC telescope at NAO Rozhen, Bulgaria. We analyzed 2.3 yr BR-light curves of the objects. The candidates demonstrate photometric variations smaller than 0.2 mag, and no overall brightness changes has...
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Tsvetan Tsvetkov (Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences)30/08/2022, 17:45S02 Astronomy and AstrophysicsOral presentation
Analyzing our catalog of active-region-related activity events of solar cycle 24, we pay special attention to solar flares. In addition to Geostationary Operational Environmental Satellite (GOES) soft X-ray flare listing data that we investigated to associate solar flares with active regions, we added microwave flare observations by the Badary Broadband Microwave Spectropolarimeter (BBMS). ...
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