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
19 papers · 1 filter
A photometric study of chemically peculiar stars with the STEREO satellites. II. Non-magnetic chemically peculiar stars
E. Paunzen, K. T. Wraight, L. Fossati +3
We have analysed the photometric data obtained with the STEREO spacecraft for 558 non-magnetic chemically peculiar (CP) stars to search for rotational and pulsational variability.…
Catalogue of variable stars in open cluster fields
Miloslav Zejda, Ernst Paunzen, Bernhard Baumann +2
We present the first catalogue of known variable stars in open cluster regions and with up to two times the given cluster radius. This gives basic information about the distributio…
Mode identification in the high-amplitude δ Scuti star V2367 Cyg
C. Ulusoy, T. Gülmez, I. Stateva +14
We report on a multi-site photometric campaign on the high-amplitude Scuti star V2367 Cyg in order to determine the pulsation modes. We also used high-dispersion spectroscopy t…
Simultaneous UBVRI observations of the cataclysmic variable AE Aquarii: temperature and mass of fireballs
R. K. Zamanov, G. Y. Latev, K. A. Stoyanov +3
We report simultaneous multicolour observations in 5 bands (UBVRI) of the flickering variability of the cataclysmic variable AE Aqr. Our aim is to estimate the parameters (colours,…
The nature of the intra-night optical variability in blazars
R. Bachev, E. Semkov, A. Strigachev +5
In this paper we present results of a short-term optical monitoring of 13 blazars. The objects were monitored mostly in the R-band for a total of ~ 160 hours between 2006 and 2011.…
Optical Flux and Spectral Variability of Blazars
Haritma Gaur, Alok C. Gupta, A. Strigachev +9
We report the results of optical monitoring for a sample of 11 blazars including 10 BL Lacs and 1 Flat Spectrum Radio Quasar (FSRQ). We have measured the multiband optical flux and…
Multiwavelength Intraday Variability of the BL Lac S5 0716+714
Alok C. Gupta, T. P. Krichbaum, P. J. Wiita +31
We report results from a 1 week multi-wavelength campaign to monitor the BL Lac object S5 0716+714 (on December 9-16, 2009). In the radio bands the source shows rapid (~ (0.5-1.5)…
Parameters of 20 newly detected eclipsing binaries from the Kepler database
Dinko P. Dimitrov, Diana P. Kjurkchieva, Veselka S. Radeva
The paper presents a sample of newly detected eclipsing binaries from the public Kepler data. Orbits and fundamental parameters of 20 unknown eclipsing binaries were determined by…
The DWARF project: Eclipsing binaries - precise clocks to discover exoplanets
T. Pribulla, M. Vaňko, M. Ammler - von Eiff +53
We present a new observational campaign, DWARF, aimed at detection of circumbinary extrasolar planets using the timing of the minima of low-mass eclipsing binaries. The observation…
14 Ceti: A probable Ap-star-descendant entering the Hertzsprung gap
M. Auriere, R. Konstantinova-Antova, P. Petit +5
14 Ceti is a subgiant star of F spectral class that displays variations in the S-index of its CaII H & K lines and an X-ray emission that is stronger than the mean observed for its…
Optical photometric and spectral study of the new FU Orionis object V2493 Cyg (HBC 722)
E. H. Semkov, S. P. Peneva, U. Munari +7
We present new results from optical photometric and spectroscopic observations of the eruptive pre-main sequence star V2493 Cyg (HBC 722). The object has continued to undergo signi…
International observational campaigns of the last two eclipses in EE Cephei: 2003 and 2008/9
C. Gałan, M. Mikołajewski, T. Tomov +87
Two observational campaigns were carried out during the eclipses of EE Cep in 2003 and 2008/9 to verify whether the eclipsing body in the system is indeed a dark disk and to unders…
Compressive Sensing for Polyharmonic Subdivision Wavelets With Applications to Image Analysis
Ognyan Kounchev, Damyan Kalaglarsky
We apply successfully the Compressive Sensing approach for Image Analysis using the new family of Polyharmonic Subdivision wavelets. We show that this approach provides a very effi…
Quantization Opportunities for Polyharmonic Subdivision Wavelets Applied to Astronomical Images
Ognyan Kounchev, Damyan Kalaglarsky
We continue the study of a new family of multivariate wavelets which are obtained by "polyharmonic subdivision". We provide the results of experiments considering the distribution…
Rotation-stimulated structures in the CN and C3 comae of comet 103P/Hartley 2 around the EPOXI encounter
W. Waniak, G. Borisov, M. Drahus +1
In late 2010 a Jupiter Family comet 103P/Hartley 2 was a subject of an intensive world-wide investigation. On UT October 20.7 the comet approached the Earth within only 0.12 AU, an…
A Possible Detection of Occultation by a Proto-planetary Clump in GM Cephei
The YETI Collaboration, W. P. Chen, S. C. -L. Hu +41
GM Cep in the young (~4 Myr) open cluster Trumpler 37 has been known to be an abrupt variable and to have a circumstellar disk with very active accretion. Our monitoring observatio…
Recent photometry of symbiotic stars - XIII
A. Skopal, S. Shugarov, M. Vanko +4
We present new multicolour (UBVRcIc) photometric observations of classical symbiotic stars, EG And, Z And, BF Cyg, CH Cyg, CI Cyg, V1329 Cyg, TX CVn, AG Dra, Draco C1, AG Peg and A…
Kinematics and helicity evolution of a loop-like eruptive prominence
K. Koleva, M. S. Madjarska, P. Duchlev +4
We aim at investigating the morphology, kinematic and helicity evolution of a loop-like prominence during its eruption. We use multi-instrument observations from AIA/SDO, EUVI/STER…
Magnetic field structure in single late-type giants: The effectively single giant V390 Aur
R. Konstantinova-Antova, M. Auriere, P. Petit +4
We have studied the active giant V390 Aur using spectropolarimetry to obtain direct and simultaneous measurements of the magnetic field and the activity indicators in order to get…