107 citations · 278 across the 19 of their papers we have counts for
19 papers
A long-term study of the magnetic field and activity in the M giant RZ Ari
R. Konstantinova-Antova, S. Georgiev, A. Lèbre +12
We present a detailed long-term study of the single M6 III giant RZ~Ari to obtain direct and simultaneous measurements of the magnetic field, activity indicators, and radial veloci…
The large-scale magnetic field of the M dwarf double-line spectroscopic binary FK Aqr
S. Tsvetkova, J. Morin, C. P. Folsom +10
This work is part of the BinaMIcS project, the aim of which is to understand the interaction between binarity and magnetism in close binary systems. All the studied spectroscopic b…
Intra-night flickering of RS Ophiuchi: III. Modes of quasi-periods in the minute scale and their evolution
Ts. B. Georgiev, R. K. Zamanov, S. Boeva +7
We study the photometric behavior of the recurrent nova RS Oph by 58 monitoring light curves (LCs), taken by 5 telescopes. All LCs show repeating time structures with some quasi-pe…
Intra-night flickering of RS Ophiuchi: I. Sizes and cumulative energies of time structures
Ts. B. Georgiev, R. K. Zamanov, S. Boeva +7
We analyzed 29 pairs of time series in B and V bands of the recurrent nova RS Oph. The observations were carried out in 2008-2017 with duration 0.6 - 3.6 hours, with time resolutio…
The recurrent nova RS Oph - simultaneous B and V band observations of the flickering variability
R. K. Zamanov, S. Boeva, G. Y. Latev +7
We performed 48.6 hours (in 28 nights) of simultaneous B and V band observations of the flickering variability of the recurrent nova RS Oph in quiescence. During the time of our ob…
Magnetic field structure in single late-type giants: The weak G-band giant 37 Comae from 2008 to 2011
Svetla Tsvetkova, Pascal Petit, Renada Konstantinova-Antova +5
This work studies the magnetic activity of the late-type giant 37 Com. This star belongs to the group of weak G-band stars that present very strong carbon deficiency in their photo…
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…
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…
The Magnetic Fields at the Surface of Active Single G-K Giants
M. Aurière, R. Konstantinova-Antova, C. Charbonnel +15
We investigate the magnetic field at the surface of 48 red giants selected as promising for detection of Stokes V Zeeman signatures in their spectral lines. We use the spectropolar…
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…
Magnetic fields in single late-type giants in the Solar vicinity: How common is magnetic activity on the giant branches?
R. Konstantinova-Antova, M. Aurière, C. Charbonnel +6
We present our first results on a new sample containing all single G,K and M giants down to V = 4 mag in the Solar vicinity, suitable for spectropolarimetric (Stokes V) observation…
Magnetic Field Structure and Activity of the He-burning Giant 37 Comae
S. Tsvetkova, P. Petit, R. Konstantinova-Antova +4
We present the first magnetic map of the late-type giant 37 Com. The Least Squares Deconvolution (LSD) method and Zeeman Doppler Imaging (ZDI) inversion technique were applied. The…
Descendants of Magnetic and non-Magnetic A-type Stars
M. Auriere, F. Lignieres, R. Konstantinova-Antova +4
We have studied the magnetic field of about 50 active and non-active single G-K-type red giants by means of spectropolarimetry with Narval and ESPaDOnS. 30 giants have been signifi…
Magnetic field structure in single late-type giants: Beta Ceti in 2010 - 2012
S. Tsvetkova, P. Petit, M. Auriere +5
The data were obtained using two spectropolarimeters - Narval at the Bernard Lyot Telescope, Pic du Midi, France, and ESPaDOnS at CFHT, Hawaii. Thirty-eight circularly-polarized sp…
Magnetic Field and Activity of the Single Late-type Giant Beta Ceti
S. Tsvetkova, M. Auriere, R. Konstantinova-Antova +3
We present the behavior of the magnetic field and activity indicators of the single late-type giant Beta Ceti in the period June 19, 2010 - December 14, 2010. We used spectropolari…
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…
A dominant magnetic dipole for the evolved Ap star candidate EK Eridani
M. Auriere, R. Konstantinova-Antova, P. Petit +8
EK Eri is one of the most slowly rotating active giants known, and has been proposed to be the descendant of a strongly magnetic Ap star. We have performed a spectropolarimetric st…
Short Term Flux and Colour Variations in Low-Energy Peaked Blazars
Bindu Rani, Alok C. Gupta, A. Strigachev +11
We have measured multi-band optical flux and colour variations for a sample of 12 low energy peaked blazars on short, day-to-month, timescales. Our sample contains six BL Lacertae…
UBVRI observations of the flickering of RS Ophiuchi at Quiescence
R. K. Zamanov, S. Boeva, R. Bachev +9
We report observations of the flickering variability of the recurrent nova RS Oph at quiescence on the basis of simultaneous observations in 5 bands (UBVRI). RS Oph has flickering…