Results 91 to 100 of about 16,821,719 (299)

X-rays from quiescent low-mass X-ray binary transients

open access: yes, 2000
International audienceI argue that it is very unlikely that X- rays from quiescent black-hole low-mass X-ray binary transients are emitted by coronae of companion stars.
Lasota, J. -P.
core   +1 more source

The Peculiar Disk Evolution of 4U 1630-472 Observed by Insight-HXMT During its 2022 and 2023 Outbursts

open access: yesThe Astrophysical Journal
We study the spectral properties of the black hole X-ray transient binary 4U 1630–472 during its 2022 and 2023 outbursts with Insight-HXMT observations. We find that the outbursts are in peculiar soft states.
Jing-Qiang Peng   +12 more
doaj   +1 more source

Catalog of Outbursts of Neutron Star Low-mass X-Ray Binaries

open access: yesThe Astrophysical Journal Supplement Series
Abstract Many X-ray binaries (XRBs) are transiently accreting. Having statistics on their recurrence times is helpful to address questions related to binary evolution and populations, as well as the physics of binary systems. We compile a catalog of known outbursts of 87 transient neutron stars (identified through bursts or pulsations ...
Craig O. Heinke   +6 more
openaire   +2 more sources

A Lack of Radio Emission from Neutron Star Low‐Mass X‐Ray Binaries

open access: yesThe Astrophysical Journal, 2005
We report strict upper limits to the radio luminosities of three neutron star low-mass X-ray binaries obtained with the Very Large Array while they were in hard X-ray states as observed with the Rossi X-ray Timing Explorer: 1E 1724-307, 4U 1812-12, and SLX 1735-269.
Muno, Michael P.   +5 more
openaire   +2 more sources

Discovery of Energy‐Localized Trap States via Opto‐Electrical Spectroscopy in UWBG Perovskite La:SrSnO3 FETs

open access: yesAdvanced Functional Materials, EarlyView.
Combined UV–vis transmittance and wavelength‐dependent photo‐assisted DC I–V analyses reveal defect‐induced optical instability and a high density of deep donor‐like subgap traps in La‐doped SrSnO3. The resulting MOSFET achieves one of the highest on/off ratios reported for ABO3 perovskite devices, demonstrating the promise of stannate perovskites as ...
Sojin Jung   +17 more
wiley   +1 more source

Optical & X-ray Studies of Ultraluminous X-ray Sources [PDF]

open access: yes, 2009
Ultraluminous X-ray Sources (ULXs) are point like X-ray sources situated external to the nucleus of their host galaxy, with inferred X-ray luminosities in excess of 10^{39} erg s^{−1} .
Gladstone, Jeanette Claire   +1 more
core  

On the Broadening of the Characteristic Frequency Range toward Higher Photon Energies in the X-Ray Variability of the Black Hole Transient MAXI J1820+070

open access: yesThe Astrophysical Journal
Energy-dependent X-ray power spectral states and band-limited noise (BLN) components have been seen in the low-hard state and intermediate states of black hole X-ray binaries.
ChenXu Gao, Wenfei Yu, Zhen Yan
doaj   +1 more source

News on the X-ray emission from hot subdwarf stars

open access: yesOpen Astronomy, 2017
In latest years, the high sensitivity of the instruments on-board the XMM-Newton and Chandra satellites allowed us to explore the properties of the X-ray emission from hot subdwarf stars.
Palombara Nicola La, Mereghetti Sandro
doaj   +1 more source

Evolving Neutron Star Low-Mass X-ray Binaries to Ulta-compact X-ray Binaries

open access: yes, 2010
7pages, 3figures. To appear in Proceedings for "Compact stars in the QCD phase diagram II (CSQCD II), May 20-24, 2009, KIAA at Peking University, Beijing - P. R. China [http://vega.bac.pku.edu.cn/rxxu/csqcd.htm]
openaire   +2 more sources

Measurement of neutron star parameters: A review of methods for low-mass X-ray binaries [PDF]

open access: yesAdvances in Space Research, 2010
30 pages, 20 figures, 1 table, An Invited and Refereed Review, will be published in "Advances in Space Research"
openaire   +2 more sources

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