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5 papers
Detection and luminosity-dependent evolution of the high-energy hump in the Be/X-ray pulsar 1A 1118-61
Alexander Salganik, Sergey S. Tsygankov, Sergey V. Molkov +12
Context. Accreting X-ray pulsars exhibit strong luminosity-dependent changes in their broad-band spectra. At high luminosities, their spectra are usually described by a power-law c…
Temporal evolution of the circumstellar disk orientation in the transient X-ray pulsar GRO J1008-57
Yongfeng Hu, Hua Xiao, Sergey S. Tsygankov +3
The transient X-ray pulsar GRO J1008-57 was previously found to exhibit Type I outbursts occurring at stable orbital phases before its first observed Type II outburst in 2012. In t…
Marginally stable nuclear burning triggered at different depths of the neutron star surface in Low-mass X-ray binary 4U 1608-52
Lyu Ming, Zhang Guobao, Mendez Mariano +1
We investigated the timing and spectral properties of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1608-52 using NICER observa…
Propeller effect in action: Unveiling quenched accretion in the transient X-ray pulsar 4U 0115+63
Hua Xiao, Sergey S. Tsygankov, Valery F. Suleimanov +3
The Be/X-ray pulsar 4U 0115+63 underwent a type II outburst in 2023. After the outburst, similar to the outbursts in 2015 and 2017, the source decayed into a quiescent state. Two o…
A Systematic Study of Millihertz Quasiperiodic Oscillations in GS 1826-238
Hua Xiao, Long Ji, Sergey Tsygankov +3
We performed a systematic investigation of millihertz quasiperiodic oscillations (mHz QPOs) in the low-mass X-ray binary GS 1826238 observed with {\it NICER} and {\it Insight}-H…