|Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536|
|Zhang Hui; Yu WenFei
|Source Publication||RESEARCH IN ASTRONOMY AND ASTROPHYSICS
|Abstract||Observations of black hole and neutron star X-ray binaries show that the luminosity of the hard-to-soft state transition is usually higher than that of the soft-to-hard state transition, indicating additional parameters other than mass accretion rate are required to interpret spectral state transitions. It has been found in some individual black hole or neutron star soft X-ray transients that the luminosity corresponding to the hard-to-soft state transition is positively correlated with the peak luminosity of the following soft state. In this work, we report the discovery of the same correlation in the single persistent neutron star low mass X-ray binary (LMXB) 4U 1636-536 based on data from the All Sky Monitor (ASM) on board RXTE, the Gas Slit Camera (GSC) on board MAXI and the Burst Alert Telescope (BAT) on board Swift. We also found such a positive correlation holds in this persistent neutron star LMXB in a luminosity range spanning about a factor of four. Our results indicate that non-stationary accretion also plays an important role in driving X-ray spectral state transitions in persistent accreting systems with small accretion flares, which is much less dramatic compared with the bright outbursts seen in many Galactic LMXB transients.|
accretion, accretion disks
|Funding Project||[National Program on Key Research and Development Project]
; [National Natural Science Foundation of China]
; [FAST Scholar fellowship]
|First Author Affilication||National Astronomical Observatories, Chinese Academy of Sciences
Zhang Hui,Yu WenFei. Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(3).
Zhang Hui,&Yu WenFei.(2018).Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(3).
Zhang Hui,et al."Effect of non-stationary accretion on spectral state transitions: An example of a persistent neutron star LMXB 4U 1636-536".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.3(2018).
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