1 citations · 1 across the 7 of their papers we have counts for
7 papers · 1 filter
H_alpha observations of the Be/X-ray binary MWC 656
R. Zamanov, V. Marchev, K. A. Stoyanov +8
Context. MWC 656 is a Be/X-ray binary identified as an emission-line object, X-ray and radio source and might be a weak gamma-ray source, harbouring an enigmatic secondary componen…
BV photometry of the cataclysmic variable LY UMa
L. Dankova, D. Marchev, S. Peneva +1
We performed B- and V-band photometry of the probable dwarf nova LY UMa. We find that it has apparent magnitude V=15.26+/-0.03 on 2024-04-14, V=15.43+/-0.02 on 2025-04-28, and V =…
Is Mira B a low mass white dwarf?
R. K. Zamanov, V. Irincheva, B. Spassov +8
We report photometric observations in Johnson B and V bands of the short term variability (flickering) of Mira (omicron Ceti). The observations were performed during 7 nights in th…
Observational signs of limited flare area variation and peak flare temperatures estimations in main-sequence flaring stars
K. Bicz, R. Falewicz, P. Heinzel +8
In the study of stellar flares, traditional method of calculating total energy emitted in the continuum assumes the emission originating from a narrow chromospheric condensation re…
Red giant component of the recurrent nova T Coronae Borealis
R. K. Zamanov, D. Marchev, V. Marchev +5
We performed simultaneous V band photometry and spectroscopic observations of the recurrent nova T CrB and estimate the V band magnitude of the red giant. We find for the red giant…
Size of the accretion disc in the recurrent nova T CrB
R. K. Zamanov, K. A. Stoyanov, V. Marchev +7
We present high resolution (0.06 A/px) spectroscopic observations of the recurrent nova T Coronae Borealis obtained during the last 1.5 years (September 2022 -- January 2024), with…
Accretion in the recurrent nova T CrB: Linking the superactive state to the predicted outburst
R. Zamanov, S. Boeva, G. Y. Latev +6
Context: T CrB (NOVA CrB 1946) is a famous recurrent nova with a recurrence timescale of 80 years. Aims: We aim to estimate the colours, luminosity, and mass-accretion rate for T C…