Be/X-ray binaries

Abstract

The purpose of this work is to review the observational properties of Be/X-ray binaries. The open questions in Be/X-ray binaries include those related to the Be star companion, that is, the so-called "Be phenomenon", such as, timescales associated to the formation and dissipation of the equatorial disc, mass-ejection mechanisms, V/R variability, and rotation rates; those related to the neutron star, such as, mass determination, accretion physics, and spin period evolution; but also, those that result from the interaction of the two constituents, such as, disc truncation and mass transfer. Until recently, it was thought that the Be stars' disc was not significantly affected by the neutron star. In this review, I present the observational evidence accumulated in recent years on the interaction between the circumstellar disc and the compact companion. The most obvious effect is the tidal truncation of the disc. As a result, the equatorial discs in Be/X-ray binaries are smaller and denser than those around isolated Be stars.

"The final publication is available at http://www.springerlink.com". This review article has been accepted for publication in Astrophysics and Space Science

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• Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc
• Multi-band observations of Swift J0840.7-3516: a new transient ultra-compact X-ray binary candidate
• Radius, rotational period and inclination of the Be stars in the Be/gamma-ray binaries MWC 148 and MWC 656
• AstroSat observations of the Be/X-ray binary XTE J1946+274 during 2018 and 2021 outbursts
• Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars
• Identification of an X-ray Pulsar in the BeXRB system IGR J18219$-$1347
• An X-ray view of the 2021 outburst of SXP 15.6: constraints on the binary orbit and magnetic field of the Neutron Star
• SXP214, an X-ray Pulsar in the Small Magellanic Cloud, Crossing the Circumstellar Disk of the Companion
• Multiwavelength observation of 1A 0535+262=HD 245770 from 2010 to 2021
• 3xmm j181923.7$-$170616: an x-ray binary with a 408s pulsar
• Study of the X-ray Pulsar IGR J21343+4738 based on NuSTAR, Swift, and SRG data
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• Precursors and Outbursts of A 0535+26 in 2009-2011 observed by the MAXI/GSC and the Swift/BAT
• Retrograde wind accretion -- an alternative mechanism for long spin-period of SFXTs
• Broadband study of the Be X-ray binary RX J0520.5-6932 during its outburst in 2024
• Observational constraints on the magnetic field of the bright transient Be/X-ray pulsar SXP 4.78
• HD 63021: Chromospheric Activity and Mass Transfer in a Close Binary
• Don't torque like that. Measuring compact object magnetic fields with analytic torque models
• One of Everything: The Breakthrough Listen Exotica Catalog
• AstroSat observations of eclipsing high mass X-ray binary pulsar OAO 1657-415
• NGC 663 as a laboratory for massive star evolution
• Measuring the magnetic dipole moment and magnetospheric fluctuations of accretion-powered pulsars in the Small Magellanic Cloud with an unscented Kalman filter
• Characteristics and evolution of Be-type high mass X-ray binaries as potential Ultraluminous X-ray Sources
• Kinematic distinction of the two subpopulations of X-ray pulsars
• Exploration of Spin-down Rate of Neutron Star in High Mass X-ray Binaries
• Recurrent low-level luminosity behaviour after a giant outburst in the Be/X-ray transient 4U 0115+63
• Variability study of the High Mass X-ray Binary IGR J18027--2016 with {\it Swift}--XRT
• New Field OB and OBe Binaries of the SMC Wing: Observational Properties and Population Modeling
• The likely Fermi detection of the Be X-ray binary GRO J1008-57: hint for gamma-ray production in neutron-star X-ray binaries
• Discovery of a bimodal luminosity distribution in persistent Be/X-ray pulsar 2RXP J130159.6-635806
• Timing and spectral properties of Be/Xray pulsar 4U 1901+03 during 2019 outburst
• NuSTAR discovery of a cyclotron line in GRO J1750-27
• Searching for the highest energy of pulsation and critical luminosity of Swift J0243.6+6124 observed by Insight-HXMT
• The high-energy cyclotron line in 2S 1417-624 discovered with Insight-HXMT during the 2018 outburst
• Tree-based solvers for adaptive mesh refinement code FLASH -- IV: An X-ray radiation scheme to couple discrete and diffuse X-ray emission sources to the thermochemistry of the interstellar medium
• Unveiling the origin of the optical/UV emission from the Galactic ULX Swift J0243.6+6124 during its 2017-2018 giant outburst
• The spin-down accretion regime of Galactic ultra-luminous X-ray pulsar Swift J0243.6+6124
• Detection of the thermonuclear X-ray bursts and dips from the X-ray binary 4U 1323-62 with AstroSat/LAXPC
• Simultaneous Resonant Excitation of Low-frequency Eccentric Wave and Tilt Wave on Tidally Deformed Disks
• Effects of variability of X-ray binaries on the X-ray luminosity functions of Milky Way
• A Striking Confluence Between Theory and Observations of High-Mass X-ray Binary Pulsars
• Spectral and timing analysis of BeXRB eRASSU J050810.4-660653 recently discovered in the Large Magellanic Cloud (LMC)
• Spectral properties of the Be/X-ray pulsar 2S 1553-542 during Type II outbursts
• An eccentric wave in the circumstellar disc of the Be/X-ray binary X Persei
• Stellar response after stripping as a model for common-envelope outcomes
• Double-hump spectrum, pulse profile dip, and pulsed fraction spectra from the low-accretion regime in the X-ray pulsar MAXI J0655-013
• SXP7.92: A Recently Rediscovered Be/X-ray Binary in the Small Magellanic Cloud, Viewed Edge On
• Recurrent outbursts revealed in 3XMM J031820.8-663034
• Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY CMa
• Spectro-timing analysis of Be X-ray pulsar SMC X-2 during the 2022 outburst
• Optical flares due to X-ray irradiation during BeXRB major outbursts
• SALT spectroscopy of the HMXB associated with the LMC supernova remnant MCSNR\,J0513$-$6724
• From Blackbirds to Black Holes: Investigating Capture-Recapture Methods for Time Domain Astronomy
• Study of recently discovered Be/X-ray pulsar MAXI J0655-013 using NuSTAR
• Discovery of a 0.8-mHz quasi-periodic oscillation in the transient X-ray pulsar SXP31.0 and associated timing transitions
• Disc breaking through forced eccentricity growth
• Spectroscopic modelling of two high-mass X-ray binaries, Cyg X--3 and 4U 1538--522
• Transient X-ray Sources in the Magellanic-type Galaxy NGC 4449
• On the origin of super-global spin-up trends of X-ray pulsars in HMXB systems
• Fast optical variability in Supergiant X-ray binaries
• Studies of Cepheus X-4 during 2018 outburst observed with AstroSat
• 4XMM J181330.1-175110: a new supergiant fast X-ray transient
• The X-Ray Binary Population with Fermi-LAT
• Super-critical accretion of BeXRB SXP 15.3
• Spectral and Timing properties of the recently discovered Be/X-ray pulsar eRASSUJ 052914.9-662446
• Low-frequency spectra of neutron star + OB supergiant binaries: Does wind density drive persistent and flaring modes of accretion?
• Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter
• Probing the emission mechanism and nature of the pulsating compact object in the X-ray binary SAX J1324.4-6200
• Non-periodic type I Be/X-ray binary outbursts
• Ultraluminous X-ray sources in the first eROSITA survey I. Candidate catalogs
• Astrophysical parameters of LS 437 and the nature of X0726-260
• Long-term optical variability of high-mass X-ray binaries. III. Polarimetry
• Timing and spectral variability in 2S 1417-624 observed with Insight-HXMT
• Probing accretion dynamics and spin evolution in the X-ray pulsar RX J0520.5-6932 during its 2024 Outburst
• Pulse frequency variations and timing noise of MXB 0656-072 during the 2007-2008 type I outbursts and implications for its magnetic field
• Insight-HXMT Spectral and Timing Studies of a Giant Outburst in RX J0440.9+4431