16 citations · 24 across the 5 of their papers we have counts for
5 papers
The FUor star V2493 Cyg (HBC 722) -- eleven years at maximum brightness
Evgeni Semkov, Sunay Ibryamov, Stoyanka Peneva
At the time of stellar evolution, young stellar objects go through processes of increased activity and instability. Star formation takes place in several stages during which the st…
Photometric and spectroscopic study of the new FUor star V2493 Cyg
E. H. Semkov, S. P. Peneva, S. I. Ibryamov
The recent results from photometric and spectroscopic study of the FUor star V2493 Cyg (HBC 722) are presented in the paper. The outburst of V2493 Cyg was registered during the sum…
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…
Long-term BVRI light curves of 5 pre-main sequence stars in the field of "Gulf of Mexico"
Sunay I. Ibryamov, Evgeni H. Semkov, Stoyanka P. Peneva
We present new data from BVRI photometric observations of five PMS stars during the period from April 2013 to July 2014. The stars are located in the field of NGC 7000/IC 5070 ("Gu…
Photometric reverberation mapping of Markarian 279
R. Bachev, A. Strigachev, E. Semkov +9
By using standard broad-band VRI photometry we were able to discriminate the variations of the broad hydrogen alpha line from the continuum variations for the active galaxy Mkn 279…