Correlated optical/X-ray long-term variability in LMXB 4U 1636-536
نویسندگان
چکیده
منابع مشابه
Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4u 1636-536
We present an analysis of XMM-Newton and RXTE data from three observations of the neutron star LMXB 4U 1636-536. The X-ray spectra show clear evidence of a broad, asymmetric iron emission line extending over the energy range 4–9 keV. The line profile is consistent with relativistically broadened Fe K-α emission from the inner accretion disk. The Fe K-α line in 4U 1636-536 is considerably broade...
متن کاملBroad Band X-ray Spectra of Atoll Source 4U 1636-536: NuSTAR and Swift Results
In this work we investigate broad band (1-79 keV) spectral nature of the atoll source 4U 1636-536 using the combined Nu-STAR and SWIFT-XRT data. The spectra are complex and have emission components from the disc, boundary-layer and corona. In addition to that a broad iron line is also observed. A relativistic line model assuming Schwarzchild metric fits this feature. The total flux varies from ...
متن کاملDiscovery of Microsecond Soft Lags in the X-Ray Emission of the Atoll Source 4U 1636-536
Exploiting the presence of kilohertz quasi-periodic oscillations (QPOs) in the timing power spectrum, we find that the soft x-ray emission of the neutron-star X-ray binary and atoll source 4U 1636-536 modulated at the QPO frequency lags behind that of the hard x-ray emission. Emission in the 3.8–6.4 keV band is delayed by 25.0±3.3 μs relative to the 9.3–69 keV band. The delay increases in magni...
متن کاملEddington-limited X-ray Bursts as Distance Indicators. Ii. Possible Compositional Effects in Bursts from 4u 1636−536
We analyzed 123 thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer from the low-mass X-ray binary 4U 1636−536. All but two of the 40 radius-exansion bursts in this sample reached peak fluxes which were normally distributed about a mean of 6.4×10 ergs cm s, with a standard deviation of 7.6%. The remaining two radius-expansion bursts reached peak fluxes a factor of 1....
متن کاملA Characterization of the Brightness Oscillations during Thermonuclear Bursts from 4u 1636[536
The discovery of nearly coherent brightness oscillations during thermonuclear X-ray bursts from six neutron star low-mass X-ray binaries has opened up a new way to study the propagation of thermonuclear burning and may ultimately lead to greater understanding of thermonuclear propagation in other astrophysical contexts, such as in Type Ia supernovae. Here, we report detailed analyses of the D58...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2011
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2010.17895.x