Insight-HXMT observations of thermonuclear X-ray bursts in 4U 1636-53
arxiv(2024)
摘要
We conducted an analysis of 45 bursts observed from 4U 1636-53. To
investigate the mechanism behind the light curve profiles and the impact of
thermonuclear X-ray bursts on the accretion environment in accreting neutron
star low-mass X-ray binaries. This analysis employed both light curve and
time-resolved spectroscopy methodologies, with data collected by the
Insight-HXMT instrument. We found that 30 bursts exhibited similar
light curve profiles and were predominantly in the hard state, and two
photospheric radius expansion (PRE) bursts were in the soft state. The light
curves of most bursts did not follow a single exponential decay but displayed a
dual-exponential behavior. The initial exponent had a duration of approximately
6 s. We utilized both the standard method and the `f_ a' method to fit
the burst spectra. The majority of the `f_ a' values exceeded 1,
indicating an enhancement of the persistent emission during the burst. Under
the two comptonization components assumption, we suggest that the scattering of
burst photons by the inner corona may mainly contribute to the persistent
emission enhancement. We also observed an inverse correlation between the
maximum f_ a and the persistent emission flux in the non-PRE burst. This
anti-correlation suggests that when the accretion rate is lower, there is a
greater enhancement of persistent emission during the burst peak. The
prediction based on Poynting-Robertson drag (P-R drag) aligns with this
observed anti-correlation.
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