56 citations · 129 across the 10 of their papers we have counts for
10 papers
Nature of 4FGL J2249.4+6229: Evidence for a redback system with a cool companion and low X-ray and -ray luminosities
A. V. Karpova, D. A. Zyuzin, S. V. Zharikov +1
We report the identification of the likely X-ray and optical counterpart to the unassociated Fermi source 4FGL J2249.4+6229. To clarify its nature, we investigate the X-ray data fr…
The stellar activity-rotation-age relationship under the lens of asteroseismology
C. Pezzotti, J. Bétrisey, G. Buldgen +6
In low-mass stars, the connection between magnetic activity, rotation period, and age provides key insights into the functioning of dynamos. Fully understanding the activity-rotati…
MASTER OT J072007.30+451611.6: A Polar with Strong Optical Variability and Suppressed He II Emission
A. V. Bobakov, S. V. Zharikov, A. V. Karpova +8
The transient optical source MASTER OT J072007.30+451611.6 has been recently discovered and proposed as a peculiar polar with an unusually high amplitude of the orbital brightness…
Superflare on a rapidly-rotating solar-type star captured in X-rays
Andrey Mukhin, Roman Krivonos, Ilfan Bikmaev +5
In this work, we studied X-ray source SRGe~J021932.4040154 (SRGe J021932), which we associated with a single X-ray active star of spectral class G2V-G4V and the rotational perio…
Optical identification and follow-up observations of SRGA J213151.5+491400 -- a new magnetic cataclysmic variable discovered with SRG Observatory
Ş. Balman, I. Khamitov, A. Kolbin +21
We report results of optical identification and multi-wavelength study of a new polar-type magnetic cataclysmic variable (MCV), SRGA J213151.5+491400, discovered by Spectrum Roentg…
A Joint SRG/eROSITA + ZTF Search: Discovery of a 97-min Period Eclipsing Cataclysmic Variable with Evidence of a Brown Dwarf Secondary
Ilkham Galiullin, Antonio C. Rodriguez, Shrinivas R. Kulkarni +24
Cataclysmic variables (CVs) that have evolved past the period minimum during their lifetimes are predicted to be systems with a brown dwarf donor. While population synthesis models…
Nature of 4FGL J1838.2+3223: a flaring `spider' pulsar candidate
D. A. Zyuzin, A. Yu. Kirichenko, A. V. Karpova +4
An unidentified -ray source 4FGL J1838.2+3223 has been proposed as a pulsar candidate. We present optical time-series multi-band photometry of its likely optical companion obtai…
The black widow pulsar J1641+8049 in the optical, radio and X-rays
A. Yu. Kirichenko, S. V. Zharikov, A. V. Karpova +14
PSR J1641+8049 is a 2 ms black widow pulsar with the 2.2 h orbital period detected in the radio and -rays. We performed new phase-resolved multi-band photometry of PSR J1641+804…
Establishing accretion flares from massive black holes as a source of high-energy neutrinos
Sjoert van Velzen, Robert Stein, Marat Gilfanov +26
The origin of cosmic high-energy neutrinos remains largely unexplained. For high-energy neutrino alerts from IceCube, a coincidence with time-variable emission has been seen for th…
LOFT: the Large Observatory For X-ray Timing
M. Feroci, J. W. den Herder, E. Bozzo +245
The LOFT mission concept is one of four candidates selected by ESA for the M3 launch opportunity as Medium Size missions of the Cosmic Vision programme. The launch window is curren…