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A model for the waveform behavior of accreting millisecond pulsars: Nearly aligned magnetic fields and moving emission regions
Frederick K. Lamb, Stratos Boutloukos, Sandor Van Wassenhove +5
We investigate further a model of the accreting millisecond X-ray pulsars we proposed earlier. In this model, the X-ray-emitting regions of these pulsars are near their spin axes b…
Implications of kHz QPOs for the spin frequencies and magnetic fields of neutron stars: new results from Circinus X-1
Stratos Boutloukos, Frederick K. Lamb
Detection of paired kilohertz quasi-periodic oscillations (kHz QPOs) in the X-ray emission of a compact object is compelling evidence that the object is an accreting neutron star.…
Accreting Neutron Stars in Low-Mass X-Ray Binary Systems
Frederick K. Lamb, Stratos Boutloukos
Using the Rossi X-ray Timing Explorer (RossiXTE), astronomers have discovered that disk-accreting neutron stars with weak magnetic fields produce three distinct types of high-frequ…
High Frequency QPOs in Neutron Stars and Black Holes: Probing Dense Matter and Strong Gravitational Fields
Frederick K. Lamb
Quasi-periodic oscillations (QPOs) have been discovered in the X-ray emission of many neutron stars and black holes. The QPOs with frequencies greater than about 300 Hz are thought…
Peak Luminosities of the Hard States of GX 339-4: Implications for the Accretion Geometry, Disk Mass, and Black Hole Mass
Wenfei Yu, Frederick K. Lamb, Robert Fender +1
We have analyzed observations of the black hole transient {GX 3394} made with the {\it Rossi} X-ray Timing Explorer (RXTE) and the Burst and Transient Source Experiment (BATSE)…
Production and evolution of millisecond X-ray and radio pulsars
Frederick K. Lamb
Observations using the Rossi X-ray Timing Explorer have discovered dozens of accreting neutron stars with millisecond spin periods in low-mass binary star systems. Eighteen are mil…
Understanding High-Density Matter Through Analysis of Surface Spectral Lines and Burst Oscillations from Accreting Neutron Stars
Sudip Bhattacharyya, M. Coleman Miller, Tod E. Strohmayer +2
We discuss millisecond period brightness oscillations and surface atomic spectral lines observed during type I X-ray bursts from a neutron star in a low mass X-ray binary system. W…
Spin Rates and Magnetic Fields of Millisecond Pulsars
Frederick K. Lamb, Wenfei Yu
Observations made using the Rossi X-ray Timing Explorer have shown that accreting weak-field neutron stars in low-mass X-ray binary systems (LMXBs) produce three distinct types of…
Sonic-Point and Spin-Resonance Model of the Kilohertz QPO Pairs
Frederick K. Lamb, M. Coleman Miller
KHz QPOs have now been detected in more than twenty accreting neutron stars in low-mass binary systems. Two kHz QPOs are usually detected in each star. Burst oscillations and two k…
Eccentric orbits and QPOs in neutron star X-ray binaries
D. Markovic, F. K. Lamb
We investigate the suggestion that the frequencies of the kilohertz and other QPOs in the emission from neutron stars in low-mass X-ray binaries are generated by geodesic motion of…
Changing Frequency Separation of Kilohertz Quasi-Periodic Oscillations in the Sonic-Point Beat-Frequency Model
Frederick K. Lamb, M. Coleman Miller
Previous work on the sonic-point beat-frequency (SPBF) model of the kilohertz quasi-periodic oscillations (QPOs) observed in the X-ray flux from neutron stars in low-mass binary sy…
The power spectral properties of the Z-source GX 340+0
Peter G. Jonker, Michiel van der Klis, Rudy Wijnands +6
We present an analysis of ~390 ksec of data of the Z source GX 340+0 taken during 24 observations with the Rossi X-ray Timing Explorer satellite. We report the discovery of a new b…
No QPO time lags from Sco X-1 as seen with EXOSAT: a comparison with Cyg X-2
Stefan W. Dieters, Brian A. Vaughan, Erik Kuulkers +2
We have measured the phase-delay and rms amplitude spectra of CygX-2 and ScoX-1. Using EXOSAT data from the normal branch of CygX-2 we confirm earlier (Ginga) results, showing that…
The Relativistic Astrophysics Explorer: A New Mission for X-Ray Timing
P. Kaaret, J. Grindlay, F. K. Lamb +3
The great success of the Rossi X-Ray Timing Explorer (RXTE) has given us a new probe to study strong gravitational fields and to measure the physical properties of black holes and…
R-Mode Oscillations in Rotating Magnetic Neutron Stars
Luciano Rezzolla, Frederick K. Lamb, Stuart L. Shapiro
We show that r-mode oscillations distort the magnetic fields of neutron stars and that their occurrence is likely to be limited by this interaction. If the field is gtrsim 10^{16}…
On the Magnetospheric Beat-Frequency and Lense-Thirring Interpretations of the Horizontal Branch Oscillation in the Z Sources
Dimitrios Psaltis, Rudy Wijnands, Jeroen Homan +7
We study the horizontal branch oscillations (HBO) and the two simultaneous kilohertz QPOs comparing their properties in five Z sources with the predictions of the magnetospheric be…
Discovery of KiloHertz Quasi-Periodic Oscillations in the Z source GX 5-1
Rudy Wijnands, Mariano Mendez, Michiel van der Klis +3
We discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the bright low-mass X-ray binary and Z source GX 5-1 with the Rossi X-ray Timing Explorer. In the X-ray col…
The Beat-Frequency Interpretation of Kilohertz QPOs in Neutron Star Low-Mass X-ray Binaries
D. Psaltis, M. Mendez, R. Wijnands +7
Pairs of quasi-periodic oscillations (QPOs) at kilohertz frequencies are a common phenomenon in several neutron-star low-mass X-ray binaries. The frequency separation of the QPO pe…
Discovery of kilohertz quasi-periodic oscillations in the Z source GX 340+0
Peter G. Jonker, Rudy Wijnands, Michiel van der Klis +3
We have discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the Z source GX 340+0 with the Rossi X-ray Timing Explorer. The X-ray hardness-intensity and color-col…
The Origin of Kilohertz QPOs and Implications for Neutron Stars
Frederick K. Lamb, M. Coleman Miller, Dimitrios Psaltis
One of the most dramatic discoveries made with the Rossi X-Ray Timing Explorer is that many accreting neutron stars in low-mass binary systems produce strong, remarkably coherent,…
Constraints on neutron star matter from kilohertz QPOs
F. K. Lamb, M. C. Miller, D. Psaltis
One of the most dramatic discoveries made so far with the Rossi X-Ray Timing Explorer is that many accreting neutron stars with weak magnetic fields generate strong, remarkably coh…
Rapid X-Ray Variability of Neutron Stars in Low-Mass Binary Systems
Frederick K. Lamb, M. Coleman Miller, Dimitrios Psaltis
The dramatic discovery with the Rossi X-Ray Timing Explorer satellite of remarkably coherent 300--1200 Hz oscillations in the X-ray brightness of some sixteen neutron stars i…
Constraints on the Equation of State of Neutron Star Matter From Observations of Kilohertz QPOs
M. Coleman Miller, Frederick K. Lamb, Dimitrios Psaltis
The frequencies of the highest-frequency kilohertz QPOs recently discovered in some sixteen neutron stars in low-mass X-ray binary systems are most likely the orbital frequencies o…
Discovery of KiloHertz Quasi-Periodic Oscillations in 4U 1735-44
Rudy Wijnands, Michiel van der Klis, Mariano Mendez +5
We discovered a single kHz quasi-periodic oscillation (QPO) near 1150 Hz in the Rossi X-ray Timing Explorer X-ray light curve of the low mass X-ray binary and atoll source 4U 1735-…