scholarly journals The Evolution of Accretion Disks with Coronae: A Model for the Low-Frequency Quasi-periodic Oscillations in X-Ray Binaries

1995 ◽  
Vol 452 ◽  
pp. 379 ◽  
Author(s):  
Marek A. Abramowicz ◽  
Xingming Chen ◽  
Ronald E. Taam
Keyword(s):  
Accretion Disks ◽  
Low Frequency ◽  
Periodic Oscillations ◽  
X Ray ◽  
X Ray Binaries

scholarly journals Magnetically Driven Warping and Precession of Accretion Disks: Implications for Exotic Stellar Variabilities

2002 ◽  
Vol 187 ◽  
pp. 215-220
Author(s):  
Dong Lai
Keyword(s):  
Accretion Disks ◽  
Low Frequency ◽  
Disk Accretion ◽  
X Ray ◽  
T Tauri ◽  
Magnetic Stars ◽  
Low Mass ◽  
Inner Region ◽  
X Ray Binaries

AbstractThe inner region of the accretion disk around a magnetized star is subjected to magnetic torques that induce warping and precession of the disk. These torques arise from interactions between the stellar field and the induced electric currents in the disk. These novel magnetic effects give rise to some “exotic” stellar variabilities, and may play an important role in explaining a number of puzzling behaviors related to disk accretion onto magnetic stars, such as mHz QPOs in X-ray pulsars, long-term periodicities of X-ray binaries (including precession of jets), low-Frequency (10-50 Hz) QPO’s in low-mass X-ray binaries, and photometric variabilities of T Tauri stars.

scholarly journals A possible origin of kilohertz quasi-periodic oscillations in low-mass X-ray binaries

2020 ◽  
Vol 72 (3) ◽  
Author(s):  
Shoji Kato ◽  
Mami Machida
Keyword(s):  
Accretion Disks ◽  
Radial Direction ◽  
Rotational Instability ◽  
Periodic Oscillations ◽  
X Ray ◽  
Resonant Instability ◽  
Low Mass ◽  
Magnetohydrodynamic Simulations ◽  
X Ray Binaries ◽  
Possible Cause

Abstract A possible origin of kilohertz quasi-periodic oscillations (QPOs) in low-mass X-ray binaries is proposed. Recent numerical magnetohydrodynamic simulations of accretion disks with turbulent magnetic fields of magneto-rotational instability definitely show the presence of two-armed spiral structure in the quasi-steady state of accretion disks. In such deformed disks, two-armed ($m=2$) c-mode ($n=1$) oscillations are excited by wave–wave resonant instability. Among these excited oscillations, the fundamental in the radial direction ($n_{\rm r}=0$) will be the higher kHz QPO of twin QPOs, and the first overtone ($n_{\rm r}=1$) in the radial direction will be the lower kHz QPO of the twin. A possible cause of the twin high-frequency QPOs in black hole X-ray binaries is also discussed in the final section.

scholarly journals Quasi-Periodic Oscillations in Low-Mass X-ray Binaries

1987 ◽  
Vol 125 ◽  
pp. 321-331
Author(s):  
M. van der Klis
Keyword(s):  
Neutron Star ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Periodic Oscillations ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

The properties of the rapid, persistent quasi-periodic oscillations (QPO) discovered with EXOSAT in the X-ray flux of at least 7 bright low-mass X-ray binaries are described. Particular attention is given to the various relations observed between QPO frequency and X-ray intensity, the link between QPO and the low-frequency noise in the X-ray intensity and the bimodal properties of in particular Sco X-1, GX 5-1 and Cyg X-2. The merits of the hypothesis that the QPO indicate the presence of a neutron star with a magnetosphere are considered.

scholarly journals A model of low-frequency quasi-periodic oscillations in black hole X-ray binaries

2012 ◽  
Vol 12 (6) ◽  
pp. 661-670 ◽  
Author(s):  
Zhi-Yun Wang ◽  
Chang-Yin Huang ◽  
Ding-Xiong Wang ◽  
Jiu-Zhou Wang
Keyword(s):  
Black Hole ◽  
Low Frequency ◽  
Periodic Oscillations ◽  
X Ray ◽  
X Ray Binaries
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