Maximum orbital frequencies for rotating neutron stars and strange stars and kHz QPOs in low-mass X-ray binaries

2005 ◽  
Author(s):  
D. Gondek-Rosińska
Keyword(s):  
Neutron Stars ◽  
Strange Stars ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

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

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.

scholarly journals Non-Linear Resonances in Accretion Disks and QPOs

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.

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

2015 ◽  
Vol 577 ◽  
pp. A5 ◽  
Author(s):  
A. Turlione ◽  
D. N. Aguilera ◽  
J. A. Pons
Keyword(s):  
Neutron Stars ◽  
Thermal Emission ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals R-modes in neutron stars: Theory and observations

2015 ◽  
Vol 24 (09) ◽  
pp. 1541007 ◽  
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.

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

2015 ◽  
Vol 455 (1) ◽  
pp. 739-753 ◽  
Author(s):  
E. M. Kantor ◽  
M. E. Gusakov ◽  
A. I. Chugunov
Keyword(s):  
Neutron Stars ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals Accreting Neutron Stars

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.

scholarly journals MEASUREMENT OF THE RADIUS OF NEUTRON STARS WITH HIGH SIGNAL-TO-NOISE QUIESCENT LOW-MASS X-RAY BINARIES IN GLOBULAR CLUSTERS

2013 ◽  
Vol 772 (1) ◽  
pp. 7 ◽  
Author(s):  
Sebastien Guillot ◽  
Mathieu Servillat ◽  
Natalie A. Webb ◽  
Robert E. Rutledge
Keyword(s):  
Neutron Stars ◽  
Globular Clusters ◽  
High Signal ◽  
Signal To Noise ◽  
X Ray ◽  
Low Mass ◽  
X Ray Binaries

scholarly journals New Constraints on the Nuclear Equation of State from the Thermal Emission of Neutron Stars in Quiescent Low-mass X-Ray Binaries

2019 ◽  
Vol 887 (1) ◽  
pp. 48 ◽  
Author(s):  
Nicolas Baillot d’Etivaux ◽  
Sebastien Guillot ◽  
Jérôme Margueron ◽  
Natalie Webb ◽  
Márcio Catelan ◽  
...  
Keyword(s):  
Equation Of State ◽  
Neutron Stars ◽  
Thermal Emission ◽  
X Ray ◽  
Nuclear Equation Of State ◽  
Low Mass ◽  
X Ray Binaries
Sign in / Sign up

Export Citation Format

Share Document