A report on TypeⅡX-ray bursts from SMC X-1

作     者：Binay Rai Pragati Pradhan Bikash Chandra Paul 

作者机构：Dept.of PhysicsNorth Bengal UniversityDarjeelingWest Bengal734013India Department of Astronomy and AstrophysicsPennsylvania State UniversityPennsylvania16802USA St.Joseph's CollegeDarjeeling-734104West BengalIndia 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2018年第18卷第12期

页      面：43-52页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：SERB-DST for the research grant EMR/2016/005734 

主　　题：accretion accretion discs pulsar:individual(SMC X-1) stars:neutron X-rays:binaries X-ray:burst 

摘      要：We study RXTE PCA data for the high mass X-ray binary source SMC X-1 between 2003–10 and 2003–12 when the source was in its high *** source is found to be frequently bursting which can be seen as flares in lightcurves that occur at a rate of one every 800 s, with an average of 4–5 Type Ⅱ X-ray bursts per *** note that typically a burst was short, lasting for a few tens of seconds in addition to a few long bursts spanning more than a hundred seconds that were also *** flares apparently occupied 2.5% of the total observing time of 225.5 *** note a total of 272 flares with mean FWHM of the flare ～21 *** rms variability and aperiodic variability are independent of *** observed, the pulse profiles of the lightcurves do not change their shape, implying that there is no change in the geometry of an accretion disk due to a *** hardness ratio and rms variability of lightcurves exhibit no correlation with the *** flare fraction shows a positive correlation with the peak-to-peak ratio of the primary and secondary peaks of the pulse *** observed hardening or softening of the spectrum cannot be correlated with the flaring rate but may be due to the interstellar absorption of X-rays as evident from the change in hydrogen column density(n_H).It is found that the luminosity of the source increases with the flaring *** that the viscous timescale is equal to the mean recurrence time of flares, we fixed the viscosity parameter α ～ 0.16.