902 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Bulgarian Academy of SciencesBG224 papers
- Centre National de la Recherche ScientifiqueFR67 papers
- Sofia University "St. Kliment Ohridski"BG64 papers
- Shumen UniversityBG62 papers
- Instituto de Astrofísica de CanariasES57 papers
- Instituto de Astrofísica de AndalucíaES55 papers
- National Institute for AstrophysicsIT54 papers
- Universidad de La LagunaES50 papers
- Astronomical ObservatoryRS48 papers
- Evgeni Kharadze Georgian National Astrophysical ObservatoryGE45 papers
- Aryabhatta Research Institute of Observational SciencesIN43 papers
- Osservatorio Astrofisico di TorinoIT43 papers
21 papers · 2 filters
Recent humps and superhumps observations and an estimation of outburst parameters of the AM CVn star CR Boo
Daniela Boneva, Radoslav Zamanov, Svetlana Boeva +4
We present our observational results of AM CVn star CR Boo in the UBVR bands. Our observational campaign includes data obtained over 5 nights with the National Astronomical Observa…
For optical flickering in symbiotic star MWC 560
Dragomir Marchev, Kiril Stoyanov, Vladislav Marchev +5
This study is based on observations of MWC560 during the last two observational seasons (2020/2021 and 2021/2022). Other than looking for flickering we were interested in following…
Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017
Bartosz Dabrowski, Katarzyna Mikula, Pawel Flisek +18
The Sun is the source of different types of radio bursts that are associated with solar flares, for example. Among the most frequently observed phenomena are type III solar bursts.…
Detecting the oscillation and propagation of the nascent dynamic solar wind structure at 2.6 solar radii using VLBI radio telescopes
Maoli Ma, Guifre Molera Calves, Giuseppe Cimo +29
Probing the solar corona is crucial to study the coronal heating and solar wind acceleration. However, the transient and inhomogeneous solar wind flows carry large-amplitude inhere…
Long-term Photometric Study of the Pre-main Sequence Star V1180 Cas
Asen Mutafov, Evgeni Semkov, Stoyanka Peneva +1
In this paper results from the optical photometric observations of the pre-main-sequence star V1180 Cas are reported. The star is a young variable associated with the dark cloud Ly…
Application of Novel Interplanetary Scintillation Visualisations using LOFAR: A Case Study of Merged CMEs from September 2017
R. A. Fallows, K. Iwai, B. V. Jackson +3
Observations of interplanetary scintillation (IPS - the scintillation of compact radio sources due to density variations in the solar wind) enable the velocity of the solar wind to…
FastQSL: A Fast Computation Method for Quasi-separatrix Layers
Peijin Zhang, Jun Chen, Rui Liu +1
Magnetic reconnection preferentially takes place at the intersection of two separatrices or two quasi-separatrix layers, which can be quantified by the squashing factor Q, whose ca…
Interferometric imaging, and beam-formed study of a moving Type IV Radio burst with LOFAR
Hongyu Liu, Pietro Zucca, Kyung-Suk Cho +6
Type IV radio burst has been studied for over 50 years. However, the specifics of the radio emission mechanisms is still an open question. In order to provide more information abou…
Superhumps in the cataclysmic variable BG Tri
S. Y. Stefanov, G. Latev, S. Boeva +1
We present a detailed photometric study of the bright cataclysmic variable BG Tri using ground-based observations mainly from Rozhen Observatory, ASAS-SN, TESS, and WASP sky survey…
Eccentric orbits and apsidal motion in the eclipsing binaries EK Cep and HS Her
Olivera Latković, Kosmas Gazeas, Haralambi Markov +2
We present the first modern analysis of two young, eclipsing binaries, EK Cep and HS Her, based on new, ground-based, CCD multicolour light curves as well as the TESS observations,…
Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc
R. K. Zamanov, K. A. Stoyanov, D. Marchev +7
We present new spectroscopic observations of the Be/black hole binary MWC 656 obtained during the period 2015 - 2021. We measure the equivalent width of H (EW), H (…
Imaging of the Quiet Sun in the Frequency Range of 20-80 MHz
PeiJin Zhang, Pietro Zucca, Kamen Kozarev +7
Radio emission of the quiet Sun is considered to be due to thermal bremsstrahlung emission of the hot solar atmosphere. The properties of the quiet Sun in the microwave band have b…
Determination of the Solar Rotation Elements and Period from Ruđer Bošković's Sunspot Observations in 1777
D. Roša, D. Hržina, M. Husak +6
This paper focuses on the observations of sunspots made by Ruđer Bošković in 1777. We derived the expressions needed to calculate the elements of the Sun's rotation and period from…
Three-dimensional imaging of convective cells in the photosphere of Betelgeuse
A. López Ariste, S. Georgiev, Ph. Mathias +5
Understanding convection in red supergiants and the mechanisms that trigger the mass loss from these evolved stars are the general goals of most observations of Betelgeuse and its…
Sympathetic Quiet and Active Region Filament Eruptions
Kostadinka Koleva, Pooja Devi, Ramesh Chandra +3
We present the observations of three sympathetic filament eruptions occurring on 19 July 2015 namely F1, F2, and F3. The events were observed in UV/EUV wavelengths by Atmospheric I…
Determining rotational and macroturbulent velocities of cool magnetic giant stars
Stefan Georgiev, Agnès Lèbre, Eric Josselin +2
An original method of estimating the projected rotational velocity, , and the macroturbulent velocity, , of evolved M giant stars is presented. It is based on t…
A Long-Term Spectral Study of the Single Active Giant OP Andromedae
Stefan Georgiev, Renada Konstantinova-Antova, Ana Borisova +10
We present a spectral study of the single magnetically active K giant OP And in the period 1979 -- 2018, monitoring the variability of the activity indicator line H. Original da…
Spectroscopy of the massive interacting binary UU Cassiopeiae
P. Hadrava, M. Cabezas, G. Djurašević +9
Context. The eclipsing close binary UU Cas is an interacting massive double-periodic system with a gainer star partly hidden in an accretion disk. Aims. In order to study the physi…
Interstellar polarization and extinction toward the Recurrent Nova T CrB
Yanko Nikolov
Spectropolarimetry is a powerful tool for diagnostic of interstellar matter and gives information on the geometry of the ejected material after the novae outbursts. In this paper a…
Further Evidence for the Minifilament-Eruption Scenario for Solar Polar Coronal Jets
Tomi K. Baikie, Alphonse C. Sterling, Ronald L. Moore +4
We examine a sampling of 23 polar-coronal-hole jets. We first identified the jets in soft X-ray (SXR) images from the X-ray telescope (XRT) on the Hinode spacecraft, over 2014-2016…
The origin of the high-mass X-ray binary 4U 2206+54/BD +53 2790
V. Hambaryan, K. A. Stoyanov, M. Mugrauer +7
Based on the Gaia EDR3 astrometric parameters and our new systemic radial velocity of the high-mass X-ray binary 4U 2206+54/BD+53 2790, we studied the trace back motion of the syst…