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• W3103134446 abstract "We analyze the X-ray spectra of the atoll 4U~1705-44 when the source undergoes the island-banana state transition. We use the Rossi X-ray Timing Explorer (RXTE) and BeppoSAX observations for this analysis. We demonstrate that the broad-band energy spectral distributions for all evolutinary states can be fitted by a model, consisting two Comptonized components. One arises from the seed photons coming from a neutron star (NS) atmosphere at a temperature kT_{s1}<1.5 keV (herein Comptb) and a second resulting from the seed photons of T_{s2}~1.1-1.3 keV coming from the disk (herein Comptb2). We found that we needed to add a low-temperature blackbody and an iron-line ({Gaussian}) component to the model in order to obtain high-quality fits. The data analysis using this model indicates that the power-law photon index Gamma_{1} of our model is always about 2, independently of the spectral state. Another parameter, Gamma_{2} demonstrates a two-phase behavior depending on the spectral state. Gamma_{2} is quasi-constant at Gamma_{2}~ 2 when the electron temperature kT^{(2)}_e<80 keV and Gamma_{2} is less than 2, in the range of 1.3<Gamma_{2}<2, when kT^{(2)}_e>80 keV. This phase is similar to that was previously found in the Z-source Sco X-1. We interpret the decreasing index phase using a model in which a super-Eddington radiation pressure from the neutron star causes an expansion of the Compton cloud similar to that found previously in Sco~X-1 during the Flaring branch." @default.
• W3103134446 created "2020-11-23" @default.
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• W3103134446 date "2015-07-28" @default.
• W3103134446 modified "2023-09-26" @default.
• W3103134446 title "BEPPOSAXANDRXTESPECTRAL STUDY OF THE LOW-MASS X-RAY BINARY 4U 1705–44: SPECTRAL HARDENING DURING THE BANANA BRANCH" @default.
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• W3103134446 doi "https://doi.org/10.1088/0004-637x/808/2/142" @default.
• W3103134446 hasPublicationYear "2015" @default.
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