Modelling the spin equilibrium of neutron stars in low-mass X-ray binaries without gravitational radiation

The gravitational radiation has been proposed a long time before, as an explana- tion for the observed relatively low spin frequencies of young neutron stars and of accreting neutron stars in low-mass X-ray binaries as well. In the present work we studied the effects of the neutron star equation of state on the r-mode instability window of rotating neutron stars.

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Search for intermittent X-ray pulsations from neutron stars in low-mass X-ray binaries

Publications of the Astronomical Society of Australia ◽

10.1017/pasa.2021.6 ◽

2021 ◽

Vol 38 ◽

Author(s):

Yunus Emre Bahar ◽

Manoneeta Chakraborty ◽

Ersin Göğüş

Keyword(s):

Neutron Stars ◽

Orbital Period ◽

Oscillation Frequency ◽

Orbital Motion ◽

X Rays ◽

X Ray ◽

Second Stage ◽

Corrected Data ◽

Low Mass ◽

X Ray Binaries

Abstract We present the results of our extensive binary orbital motion corrected pulsation search for 13 low-mass X-ray binaries. These selected sources exhibit burst oscillations in X-rays with frequencies ranging from 45 to 1 122 Hz and have a binary orbital period varying from 2.1 to 18.9 h. We first determined episodes that contain weak pulsations around the burst oscillation frequency by searching all archival Rossi X-ray Timing Explorer data of these sources. Then, we applied Doppler corrections to these pulsation episodes to discard the smearing effect of the binary orbital motion and searched for recovered pulsations at the second stage. Here we report 75 pulsation episodes that contain weak but coherent pulsations around the burst oscillation frequency. Furthermore, we report eight new episodes that show relatively strong pulsations in the binary orbital motion corrected data.

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A study of accretion discs around rapidly rotating neutron stars in general relativity and its applications to four low mass X–ray binaries

Astronomy and Astrophysics ◽

10.1051/0004-6361:20011758 ◽

2002 ◽

Vol 383 (2) ◽

pp. 524-532 ◽

Cited By ~ 12

Author(s):

Sudip Bhattacharyya

Keyword(s):

General Relativity ◽

Neutron Stars ◽

Accretion Discs ◽

X Ray ◽

Low Mass ◽

X Ray Binaries

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Non-Linear Resonances in Accretion Disks and QPOs

International Astronomical Union Colloquium ◽

10.1017/s0252921100152170 ◽

2004 ◽

Vol 194 ◽

pp. 128-129

Author(s):

Włodek Kluźniak

Keyword(s):

Black Holes ◽

Neutron Stars ◽

Accretion Disk ◽

Accretion Disks ◽

High Frequency ◽

Light Curves ◽

X Ray ◽

Non Linear ◽

Low Mass ◽

X Ray Binaries

AbstractNon-linear oscillations in the accretion disk are favored as an explanation of high-frequency QPOs observed in the light curves of low-mass X-ray binaries containing neutron stars, black holes, or white dwarfs.

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Quiescent thermal emission from neutron stars in low-mass X-ray binaries

Astronomy and Astrophysics ◽

10.1051/0004-6361/201322690 ◽

2015 ◽

Vol 577 ◽

pp. A5 ◽

Cited By ~ 35

Author(s):

A. Turlione ◽

D. N. Aguilera ◽

J. A. Pons

Keyword(s):

Neutron Stars ◽

Thermal Emission ◽

X Ray ◽

Low Mass ◽

X Ray Binaries

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R-modes in neutron stars: Theory and observations

International Journal of Modern Physics E ◽

10.1142/s0218301315410074 ◽

2015 ◽

Vol 24 (09) ◽

pp. 1541007 ◽

Cited By ~ 37

Author(s):

B. Haskell

Keyword(s):

Neutron Stars ◽

Light Curves ◽

Mutual Friction ◽

Mode Instability ◽

Flux Tubes ◽

X Ray ◽

Physical Mechanisms ◽

Low Mass ◽

Superfluid Vortices ◽

X Ray Binaries

In this paper, I will review the theory behind the gravitational wave (GW) driven r-mode instability in rapidly rotating neutron stars (NSs) and discuss which constraints can be derived from observations of spins and temperatures in low mass X-ray binaries (LMXBs). I will discuss how a standard, 'minimal' NS model is not consistent with the data, and discuss some of the additional physical mechanisms that could reconcile theory with observations. In particular, I will focus on additional forms of damping due to exotic cores and on strong mutual friction due to superfluid vortices cutting through superconducting flux tubes, and examine the repercussions these effects could have on the saturation amplitude of the mode. Finally I will also discuss the possibility that oscillations due to r-modes may have been recently observed in the X-ray light curves of two LMXBs.

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Observational signatures of neutron stars in low-mass X-ray binaries climbing a stability peak

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stv2352 ◽

2015 ◽

Vol 455 (1) ◽

pp. 739-753 ◽

Cited By ~ 11

Author(s):

E. M. Kantor ◽

M. E. Gusakov ◽

A. I. Chugunov

Keyword(s):

Neutron Stars ◽

X Ray ◽

Low Mass ◽

X Ray Binaries

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Accreting Neutron Stars

Symposium - International Astronomical Union ◽

10.1017/s007418090016067x ◽

1987 ◽

Vol 125 ◽

pp. 135-148

Author(s):

N.E. White

Keyword(s):

Magnetic Field ◽

Field Strength ◽

Neutron Stars ◽

Magnetic Field Strength ◽

Spectral Properties ◽

High Mass ◽

X Ray ◽

Temporal Properties ◽

Low Mass ◽

X Ray Binaries

This paper reviews accreting neutron stars in X-ray binaries, with particular emphasis on how variations in magnetic field strength may be responsible for explaining the spectral and temporal properties observed from the various systems. This includes a review of X-ray pulsars in both low and high mass systems, and a discussion of the spectral properties of the low mass X-ray binaries.

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