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The Binary X-Ray Stars – the Observational Picture [PDF]

open access: bronzeSymposium - International Astronomical Union, 1975
When X-ray sources in the galaxy were discovered in 1962 (Giacconi et al., 1962) it was only possible to speculate on their nature, which centered on supernova and cosmic-ray phenomena since these were the only very energetic events known. In particular, the discovery of an X-ray source associated with the Crab Nebula led to the idea that the emission ...
H. Gursky, E. Schreier
openalex   +3 more sources

Be stars in X-ray binary systems [PDF]

open access: bronzeInternational Astronomical Union Colloquium, 2000
AbstractThis paper will review the status of our observations and understanding of Be stars in X-ray binary systems. In virtually all cases the binary partner to the Be star is a neutron star. The circumstellar disk provides the accretion fuel and hence stimulates the X-ray emission, whilst the neutron star provides a valuable probe of the environment ...
M. J. Coe
openalex   +4 more sources

High-Mass X-Ray Binaries and OB Runaway Stars [PDF]

open access: bronzeInternational Astronomical Union Colloquium, 2004
AbstractHigh-mass X-ray binaries (HMXBs) represent an important phase in the evolution of massive binary systems and provide fundamental information on the properties of the OB-star primaries and their compact secondaries (neutron star, black hole). Recent observations indicate that the neutron stars in some of these systems (Vela X-1, 4U 1700-37) are ...
L. Kaper, A. van der Meer, A. Tijani
openalex   +7 more sources

The X-ray emission of Be+stripped star binaries★

open access: yesMonthly Notices of the Royal Astronomical Society, 2022
ABSTRACT Using observations from Chandra, Swift, and XMM-Newton, we investigate the high-energy properties of all known (18) Be+sdO systems as well as seven additional Be binaries suspected to harbour stripped stars. The observed X-ray properties are found to be similar to those observed for other Be samples.
Yaël Nazé   +3 more
openaire   +2 more sources

On X‐Ray Variability in Active Binary Stars [PDF]

open access: yesThe Astrophysical Journal, 1999
We compare the count-rates of active binaries observed by Einstein and ROSAT. We find significant evidence for short-term variability (approx 0.32) and marginal evidence for a larger variability at longer timescales (approx 0.38). Modeling this excess as cyclic variability, we place an upper limit on the relative amplitude of the cyclic component ...
Vinay Kashyap, Jeremy J. Drake
openaire   +3 more sources

Ultracompact X-ray binaries with He star companions [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2021
ABSTRACT Ultracompact X-ray binaries (UCXBs) are low-mass X-ray binaries with hydrogen-deficient mass donors and ultrashort orbital periods. They have been suggested to be the potential Laser Interferometer Space Antenna (LISA) sources in the low-frequency region. Several channels for the formation of UCXBs have been proposed so far.
Yunlang Guo   +8 more
openaire   +2 more sources

An X-Ray-dim “Isolated” Neutron Star in a Binary?

open access: yesThe Astrophysical Journal Letters, 2023
Abstract We report the discovery of a dark companion to 2MASS J15274848+3536572 with an orbital period of 6.14 hr. Combining the radial velocity from LAMOST observations and modeling of the multiband light curve, one obtains a mass function of ≃0.131 M ⊙, an inclination of
Jie Lin   +15 more
openaire   +3 more sources

Unveiling Properties of the Nonthermal X-Ray Production in the Gamma-Ray Binary LS 5039 Using the Long-term Pattern of Its Fast X-Ray Variability

open access: yesThe Astrophysical Journal, 2023
Gamma-ray binary systems, a subclass of high-mass X-ray binaries, show nonthermal emissions from radio to TeV. While efficient electron acceleration is considered to take place in them, the nature of the acceleration mechanism and the physical ...
Hiroki Yoneda   +7 more
doaj   +1 more source

Multiwavelength Characterization of the High-mass X-Ray Binary Population of M33

open access: yesThe Astrophysical Journal, 2023
We present multiwavelength characterization of 65 high-mass X-ray binary (HMXB) candidates in M33. We use the Chandra ACIS survey of M33 (ChASeM33) catalog to select hard X-ray point sources that are spatially coincident with UV-bright point-source ...
Margaret Lazzarini   +14 more
doaj   +1 more source

Binary interaction dominates the evolution of massive stars [PDF]

open access: yes, 2012
The presence of a nearby companion alters the evolution of massive stars in binary systems, leading to phenomena such as stellar mergers, X-ray binaries and gamma-ray bursts.
A. de Koter   +11 more
core   +9 more sources

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