143 citations · 896 across the 61 of their papers we have counts for
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Observations and light curve solutions of ultrashort-period eclipsing binaries
Diana P. Kjurkchieva, Dinko P. Dimitrov, Sunay I. Ibryamov +1
Photometric observations in V and I bands and low-dispersion spectra of ten ultrashort-period binaries (NSVS 2175434, NSVS 2607629, NSVS 5038135, NSVS 8040227, NSVS 9747584, NSVS 4…
Multi-Band Intra-Night Optical Variability of BL Lacertae
Haritma Gaur, Alok C. Gupta, R. Bachev +5
We monitored BL Lacertae frequently during 2014 - 2016 when it was generally in a high state. We searched for intra-day variability for 43 nights using quasi-simultaneous measureme…
Long-term photometric observations in the field of the star formation region NGC7129
Evgeni Semkov, Stoyanka Peneva, Sunay Ibryamov +1
We present results from long-term optical photometric observations of the Pre-Main Sequence (PMS) stars, located in the star formation region around the bright nebula NGC 7129. Usi…
Dissecting the long-term emission behaviour of the BL Lac object Mrk 421
M. I. Carnerero, C. M. Raiteri, M. Villata +4
We report on long-term multi-wavelength monitoring of blazar Mrk 421 by the GASP-WEBT collaboration and Steward Observatory, and by the Swift and Fermi satellites. We study the sou…
Intra-night variability of the blazar CTA 102 during its 2012 and 2016 giant outbursts
R. Bachev, V. Popov, A. Strigachev +6
We obtained and analyzed more than 100 hours of multicolour optical time series of the blazar CTA 102 during its 2012 and 2016 outbursts. The object reached almost 11-th mag at the…
Observations and light curve solutions of the eclipsing stars CSS J075205.6+381909 and NSVS 691550
D. Kjurkchieva, V. Popov, D. Vasileva +2
The paper presents observations and light curve solutions of the eclipsing stars CSS J075205.6+381909 and NSVS 691550. As a result their initial epochs were determined. The target…
A deep decrease event in the brightness of the PMS star V350 Cep
Evgeni H. Semkov, Sunay I. Ibryamov, Stoyanka P. Peneva
New photometric data from CCD UBVRI observations of the PMS star V350 Cep during the period from March 2014 to May 2017 are presented. In the period April-May 2016 we registered a…
Observations and light curve solutions of the W UMa binaries V796 Cep, V797 Cep, CSS J015341.9+381641 and NSVS 3853195
D. P. Kjurkchieva, V. A. Popov, S. I. Ibryamov +2
Photometric observations in Sloan g' and i' bands of four W UMa binaries, V796 Cep, V797 Cep, CSS J015341.9+381641 and NSVS 3853195, are presented. Our observations showed that CSS…