Results 81 to 90 of about 497,978 (250)
Optical spectroscopy of (candidate) ultra-compact X-ray binaries [PDF]
, 2004 We present (preliminary) results of our systematic spectroscopic study of (candidate) ultra-compact X-ray binaries. Most candidates are confirmed and we found the first optical spectra of (pure) carbon-oxygen accretion discs.
arxiv +1 more source
A Precessing Stellar Disk Model for Superorbital Modulations of the Gamma-Ray Binary LS I+61° 303
The Astrophysical JournalGamma-ray binary LS I+61° 303 consists of a neutron star orbiting around a Be star with a period of P _orb ≃ 26.5 days. Apart from orbital modulations, the binary shows long-term flux variations with a superorbital period of ${P}_{\sup }\simeq 4.6\,{\rm ...
A. M. Chen, J. Takata, Y. W. Yu
doaj +1 more source
X-ray Pulsations in the Supersoft X-ray Binary CAL 83
, 2005 X-ray data reveal that the supersoft X-ray binary CAL 83 exhibits 38.4 minute pulsations at some epochs. These X-ray variations are similar to those found in some novae and are likely to be caused by nonradial pulsations the white dwarf.
A. P. Cowley +4 more
core +3 more sources
A review of rapid X-ray variability in X-ray binaries [PDF]
arXiv, 2004 A comprehensive review of aperiodic rapid X-ray variability (QPO and noise) in X-ray binaries with neutron stars and black holes.
arxiv
X-Ray Polarimetry as a Tool to Constrain Orbital Parameters in X-Ray Binaries
The Astrophysical JournalX-ray binary systems consist of a companion star and a compact object in close orbit. Thanks to their copious X-ray emission, these objects have been studied in detail using X-ray spectroscopy and timing.
John Rankin +12 more
doaj +1 more source
A Lack of 9 s Periodicity in the Follow-up NuSTAR Observation of LS 5039
The Astrophysical Journal, 2023 The Nuclear Spectroscopic Array (NuSTAR) observed the gamma-ray binary LS 5039 for a second time in order to check for the presence of a periodic signal candidate found in the data from the previous NuSTAR observation.
Oleg Kargaltsev +3 more
doaj +1 more source
Low-Mass X-ray Binary Populations
, 2010 Low-mass X-ray binaries (LMXBs) have been studied in the Galaxy since the beginning of X-ray astronomy. A lot has been learned about these bright X-ray sources, but significant questions are still open.
Fabbiano, G.
core +1 more source
Long-term Quasiperiodicity in LMXB 4U 1636–536
The Astrophysical Journal, 2023 We present the results of the low-mass X-ray binary 4U 1636–536 study. We performed a temporal analysis of all available RXTE/All-Sky Monitor, RXTE/Proportional Counter Array, Swift/Burst Alert Telescope, and MAXI data collected until the middle of 2022.
Mateusz Wiśniewicz +4 more
doaj +1 more source
Formation of Sco X-1 induced by anomalous magnetic braking of Ap/Bp stars
, 2017 Sco X-1 is the brightest persistent X-ray in the sky. It is generally believed that Sco X-1 is a low-mass X-ray binary containing a neutron star accreting from a low-mass donor star where mass transfer is driven by the magnetic braking. However, the mass
Chen, Wen-Cong
core +1 more source
Evolution of hard X-ray photon index in black-hole X-ray binaries: hints for accretion physics [PDF]
arXiv, 2019 The anti- and positive correlations between X-ray photon index and Eddington-scaled X-ray luminosity were found in decay phase of X-ray binary outbursts and a sample of active galactic nuclei in former works. We further systematically investigate the evolution of X-ray spectral index, along the X-ray flux and Eddington ratio in eight outbursts of four ...
arxiv