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J/ApJ/685/436       X-ray variability in 4U 1636-53          (Altamirano+, 2008)

X-ray time variability across the atoll source states of 4U 1636-53. Altamirano D., van der Klis M., Mendez M., Jonker P.G., Klein-Wolt M., Lewin W.H.G. <Astrophys. J., 685, 436-450 (2008)> =2008ApJ...685..436A
ADC_Keywords: Binaries, X-ray ; X-ray sources ; Stars, variable Keywords: accretion, accretion disks - binaries: close - stars: individual (4U 0614+09, 4U 1608-52, 4U 1636-53, 4U 1728-34, 4U 1820-30) - stars: neutron - X-rays: stars Abstract: We have studied the rapid X-ray time variability in 149 pointed observations with the Rossi X-Ray Timing Explorer (RXTE)'s Proportional Counter Array of the atoll source 4U 1636-53 in the banana state and, for the first time with RXTE, in the island state. We compare the frequencies of the variability components of 4U 1636-53 with those in other atoll and Z sources and find that 4U 1636-53 follows the universal scheme of correlations previously found for other atoll sources at (sometimes much) lower luminosities. Our results on the hectohertz QPO suggest that the mechanism that sets its frequency differs from that for the other components, while the amplitude-setting mechanism is common. A previously proposed interpretation of the narrow low-frequency QPO frequencies in different sources in terms of harmonic mode switching is not supported by our data or by previous data on other sources, and the frequency range that this QPO covers is found to be unrelated to spin, angular momentum, or luminosity. Objects: --------------------------------------------------------------------------- RA (2000) DE Designation(s) (Period) --------------------------------------------------------------------------- 16 40 55.5 -53 45 05 XB 1636-536 = 4U 1636-53 = MXB 1636-536 (P≃3.8hr) --------------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 60 149 Observations used for the timing analysis
See also: J/A+A/418/927 : RXTE All-Sky Slew Survey catalog, |b|>10° (Revnivtsev+, 2004) J/ApJ/612/437 : Low-luminosity hard X-ray binaries candidates (Suchkov+, 2004) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Inter [A-N12 ] Interval of data selection 4- 18 A15 --- ObsId Observation identification 20- 25 F6.4 --- Scol Soft color (3.5-6.0/2.0-3.5keV count ratio) (1) 27- 32 F6.4 --- e_Scol Uncertainty in Scol (1) 34- 39 F6.4 --- Hcol Hard color (9.7-16.0/6.0-9.7keV count ratio) (1) 41- 46 F6.4 --- e_Hcol Uncertainty in Hcol (1) 48- 53 F6.4 --- I(X) Intensity (2.0-16.0keV count rate) (1) 55- 60 F6.4 --- e_I(X) Uncertainty in (X) (1)
Note (1): All colors and intensities are background and deadtime corrected and normalized to the Crab Nebula (units are Crab, see Section 2).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Dec-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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