Results 1 to 10 of about 22,514,851 (295)
High-Frequency Variability in Neutron-Star Low-Mass X-ray Binaries [PDF]
, 2020 Binary systems with a neutron-star primary accreting from a companion star display variability in the X-ray band on time scales ranging from years to milliseconds. With frequencies of up to ~1300 Hz, the kilohertz quasi-periodic oscillations (kHz QPOs) represent the fastest variability observed from any astronomical object.
Méndez, Mariano +2 more
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Massive Stars and their Compact Remnants in High-mass X-ray Binaries
, 2005 In a high-mass X-ray binary (HMXB) a massive star interacts with a neutron-star or black-hole companion in various ways. The gravitational interaction enables the measurement of fundamental parameters such as the mass of both binary components, providing important constraints on the evolutionary history of the system, the equation of state of matter at
Kaper, L., van der Meer, A.
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Drop in the Hard Pulsed Fraction and a Candidate Cyclotron Line in IGR J16320–4751 Seen by NuSTAR
The Astrophysical Journal, 2023 We report on a timing and spectral analysis of a 50 ks NuSTAR observation of IGR J16320−4751 (= AX J1631.9−4752), a high-mass X-ray binary hosting a slowly rotating neutron star.
A. Bodaghee +12 more
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A New Class of High‐Mass X‐Ray Binaries: Implications for Core Collapse and Neutron Star Recoil [PDF]
The Astrophysical Journal, 2002 We investigate an interesting new class of high-mass X-ray binaries (HMXBs) with long orbital periods (P_orb > 30 days) and low eccentricities ...
Pfahl, E. +3 more
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Clumpy wind accretion in supergiant neutron star high mass X-ray binaries [PDF]
Astronomy & Astrophysics, 2016 The accretion of the stellar wind material by a compact object represents the main mechanism powering the X-ray emission in classical supergiant high mass X-ray binaries and supergiant fast X-ray transients. In this work we present the first attempt to simulate the accretion process of a fast and dense massive star wind onto a neutron star, taking into
Bozzo, Enrico +3 more
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Preliminary determinations of the masses of the neutron star and mass donor in the high mass X-ray binary system EXO 1722–363 [PDF]
Astronomy and Astrophysics, 2010 We intended to measure the radial velocity curve of the supergiant companion to the eclipsing high mass X-ray binary pulsar EXO1722-363 and hence determine the stellar masses of the components. We used a set of archival K$_{\rm s}$-band infrared spectra of the counterpart to EXO1722-363 obtained using ISAAC on the VLT, and cross-correlated them in ...
Mason, A. B. +4 more
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The Astrophysical JournalBased on Insight-HXMT observations, we present a detailed timing analysis and spectral evolution of a complete main high state for Her X-1 in 2020 February. We determine an accurate local ephemeris using the Rmer delay measured from five eclipses.
Wen Yang, Wei Wang, Qianhan Zhou
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Neutron star masses from hydrodynamical effects in obscured supergiant high mass X-ray binaries [PDF]
Astronomy & Astrophysics, 2012 Context. A population of obscured supergiant high mass X-ray binaries has been discovered by INTEGRAL. X-ray wind tomography of IGR J17252-3616 inferred a slow wind velocity to account for the enhanced obscuration. Aims. The main goal of this study is to understand under which conditions high obscuration could occur. Methods.
A. Manousakis, R. Walter, J. M. Blondin
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Detection of Multiple X-Ray Quasi-periodic Oscillations in IGR J19294+1816 with Insight-HXMT
The Astrophysical JournalWe report the timing results with Insight-HXMT observations of X-ray binary IGR J19294+1816 during its 2019 type I outburst at the decline phase shortly following its peak.
Wen Yang, Wei Wang
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Determination of wind-fed model parameters of neutron stars in high-mass X-ray binaries
Publications of the Astronomical Society of Australia, 2022 AbstractWe have studied several neutron star high-mass X-ray binaries (HMXBs) with super-giant (SG) companions using a wind-fed binary model associated with the magnetic field. By using the concept of torque balance, the magnetic field parameter determines the mass accretion rate.
Ali Taani +4 more
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