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
31 papers · 1 filter
Multi-band Optical Variability of the TeV Blazar PG 1553+113 in 2019
Vinit Dhiman, Alok C. Gupta, Sofia O. Kurtanidze +20
We report the flux and spectral variability of PG 1553+113 on intra-night (IDV) to short-term timescales using BVRI data collected over 91 nights from 28 February to 8 November 201…
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…
Optical flux and spectral variability of BL Lacertae during its historical high outburst in 2020
Nibedita Kalita, Yuhai Yuan, Minfeng Gu +9
BL Lacertae had undergone a series of historical high flux activity over a year, from August 2020 in the optical to VHE -rays. In this paper, we report on optical flux and spect…
Taking a break: paused accretion in the symbiotic binary RT Cru
A. Pujol, G. J. M. Luna, K. Mukai +10
Symbiotic binaries sometimes hide their symbiotic nature for significant periods of time. There is mounting observational evidence that in those symbiotics that are powered solely…
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…
Multi-messenger characterization of Mrk 501 during historically low X-ray and -ray activity
MAGIC collaboration, H. Abe, S. Abe +322
We study the broadband emission of Mrk 501 using multi-wavelength observations from 2017 to 2020 performed with a multitude of instruments, involving, among others, MAGIC, Fermi-LA…
Planet-star interactions with precise transit timing. III. Entering the regime of dynamical tides
G. Maciejewski, M. Fernandez, A. Sota +14
Hot Jupiters on extremely short-period orbits are expected to be unstable to tidal dissipation and spiral toward their host stars. That is because they transfer the angular momentu…
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,…
A LOOK at Outbursts of Comet C/2014 UN (Bernardinelli-Bernstein) Near 20 au
Michael S. P. Kelley, Rosita Kokotanekova, Carrie E. Holt +10
Cometary activity may be driven by ices with very low sublimation temperatures, such as carbon monoxide ice, which can sublimate at distances well beyond 20 au. This point is empha…
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 (…
Rapid X-ray Variability in Mkn 421 during a Multiwavelength Campaign
Alex G. Markowitz, Krzysztof Nalewajko, Gopal Bhatta +47
The study of short-term variability properties in AGN jets has the potential to shed light on their particle acceleration and emission mechanisms. We report results from a four-day…
The multichord stellar occultation on 2019 October 22 by the trans-Neptunian object (84922) 2003 VS
M. Vara-Lubiano, G. Benedetti-Rossi, P. Santos-Sanz +60
We predicted, observed, and analyzed the multichord stellar occultation of the Second Gaia Data Release (Gaia DR2) source 3449076721168026624 (m = 14.1 mag) by the plutino obje…
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…
Polarimetry of M-type asteroids in the context of their surface composition
I. Belskaya, A. Berdyugin, Yu. Krugly +9
Aims. We aim to investigate how polarimetric observations can improve our understanding of the nature and diversity of M/X-type asteroids. Methods. Polarimetric observations of the…
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…
Density distribution function of a self-gravitating isothermal turbulent fluid in the context of molecular clouds ensembles -- III. Virial analysis
S. Donkov, I. Zh. Stefanov, T. V. Veltchev +1
In the present work we apply virial analysis to the model of self-gravitating turbulent cloud ensembles introduced by Donkov \& Stefanov in two previous papers, clarifying some asp…
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…