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
18 papers · 2 filters
Solution of newly observed transit of the exoplanet HAT-P-24b: no TTV and TDV signals
Diana Kjurkchieva, Dinko Dimitrov, Sunay Ibryamov
We present photometric observations of transit of the exoplanet HAT-P-24b using the Rozhen 2 m telescope. Its solution gives relative stellar radius r_{s}=0.1304 (a/R_{s}=7.669), r…
Photometric variability of 14 PMS stars in the NGC 7000/IC 5070 complex
Sunay I. Ibryamov, Evgeni H. Semkov
New photometric data from CCD multicolour BVRI observations of 14 pre-main sequence stars during the period from 2013 April to 2015 September are presented. The studied objects are…
Flickering of accreting white dwarfs: the remarkable amplitude-flux relation and disc viscosity
R. K. Zamanov, S. Boeva, G. Latev +7
We analyze optical photometric data of short term variability (flickering) of accreting white dwarfs in cataclysmic variables (KR Aur, MV Lyr, V794 Aql, TT Ari, V425 Cas), recurren…
2MASSJ22560844+5954299: the newly discovered cataclysmic star with the deepest eclipse
D. Kjurkchieva, T. Khruzina, D. Dimitrov +3
Context: The SW Sex stars are assumed to represent a distinguished stage in CV evolution, making it especially important to study them. Aims: We discovered a new cataclysmic star a…
The PMS star V1184 Tau (CB 34V) at the end of prolonged eclipse
E. H. Semkov, S. P. Peneva, S. I. Ibryamov
V1184 Tau (CB 34V) lies in the field of the Bok globule CB 34 and was discovered as a large amplitude variable in 1993. According to the first hypothesis of the variability of the…
Circumstellar discs in X/gamma-ray binaries: first results from the Echelle spectrograph
R. Zamanov, K. Stoyanov, J. Martí
Here we report our first spectral observations of Be/X-ray and gamma-ray binaries obtained with the new Echelle spectrograph of the National Astronomical Observatory Rozhen. For fo…
Transient accretion disc-like envelope in the symbiotic binary BF Cygni during its 2006 - 2015 optical outburst
N. A. Tomov, M. T. Tomova, D. V. Bisikalo
The optical light of the symbiotic binary BF Cygni during its last eruption after 2006 shows orbital variations because of an eclipse of the outbursting compact object. The first o…
Broad Balmer Wings in BA Hyper/Supergiants Distorted by Diffuse Interstellar Bands: Five Examples in the 30 Doradus Region from the VLT-FLAMES Tarantula Survey
Nolan R. Walborn, Hugues Sana, Christopher J. Evans +11
Extremely broad emission wings at H and H have been found in VFTS data for five very luminous BA supergiants in or near 30 Doradus in the Large Magellanic Cloud. The profiles…
The January 2015 outburst of a red nova in M31
Alexander Kurtenkov, Peter Pessev, Toma Tomov +19
M31N 2015-01a (or M31LRN 2015) is a red nova that erupted in January 2015 -- the first event of this kind observed in M31 since 1988. Very few similar events have been confirmed as…
Long-term multicolor photometry of the young stellar objects FHO 26, FHO 27, FHO 28, FHO 29 and V1929 Cygni
S. I. Ibryamov, E. H. Semkov, S. P. Peneva
Results from long-term multicolor optical photometric observations of the pre-main sequence stars FHO 26, FHO 27, FHO 28, FHO 29 and V1929 Cyg collected during the period from June…
The unusual photometric variability of the PMS star GM Cep
E. Semkov, S. Ibryamov, S. Peneva +6
Results from UBVRI photometric observations of the pre-main sequence star GM Cep obtained in the period April 2011 - August 2014 are reported in the paper. Presented data are a con…
Difference between the optical flickering colours of cataclysmic variables and symbiotic recurrent novae
R. Zamanov, S. Boeva, G. Latev +2
We performed simultaneous observations in 3 bands (UBV) of the flickering variability of the recurrent novae RS Oph and T CrB at quiescence. Using new and published data, we compar…
Light curve solutions of six eclipsing binaries at the lower limit of periods of the W UMa stars
Diana P. Kjurkchieva, Dinko P. Dimitrov, Sunay I. Ibryamov
Photometric observations in V and I bands of six eclipsing binaries at the lower limit of the orbital periods of W UMa stars are presented. Three of them are newly discovered eclip…
Ultrashort-period MS eclipsing systems. New observations and light curve solutions of six NSVS binaries
Dinko Dimitrov, Diana Kjurkchieva
We carried out photometric and low-resolution spectral observations of six eclipsing ultrashort-period binaries with MS components. The light curve solutions of the Rozhen observat…
Light curve solutions of the ultrashort-period binaries
Diana Kjurkchieva, Dinko Dimitrov
We carried out light curve solutions of the ultrashort-period binaries with MS components observed by . All six targets turned out almost in thermal contact with contact or…
The VLT-FLAMES Tarantula Survey XVIII. Classifications and radial velocities of the B-type stars
C. J. Evans, M. B. Kennedy, P. L. Dufton +14
We present spectral classifications for 438 B-type stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud. Radial v…
The VLT-FLAMES Tarantula Survey XIX. B-type Supergiants - Atmospheric parameters and nitrogen abundances to investigate the role of binarity and the width of the main sequence
C. M. McEvoy, P. L. Dufton, C. J. Evans +19
TLUSTY non-LTE model atmosphere calculations have been used to determine atmospheric parameters and nitrogen (N) abundances for 34 single and 18 binary B-type supergiants (BSGs). T…
Optical Flickering of the recurrent nova RS Ophiuchi: amplitude - flux relation
R. Zamanov, G. Latev, S. Boeva +7
We report observations of the flickering variability of the symbiotic recurrent nova RS~Oph at quiescence in five bands (). We find evidence of a correlation between the pea…