A state-dependent influence of the type-I bursts on the accretion in 4U 1608--52?

Abstract

We investigated the possible feedback of type-I burst to the accretion process during the spectral evolution of the atoll source 4U 1608--52. By fitting the burst spectrum with a blackbody and an adjustable, persistent spectral component, we found that the latter is significant state-dependent. In the banana state the persistent flux increases along the burst evolution, while in the island state this trend holds only when the bursts are less luminous and starts to reverse at higher burst luminosities. We speculate that, by taking into account both the Poynting-Robertson drag and radiation pressure, these phenomena may arise from the interactions between the radiation field of the type-I burst and the inner region of the accretion disc.

10 pages, 5 figures, accepted by ApJ Letter

References in corpus (5)

• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• When A Standard Candle Flickers
• X-ray bursting neutron star atmosphere models using an exact relativistic kinetic equation for Compton scattering
• The effect of accretion on the measurement of neutron star mass and radius in the low-mass X-ray binary 4U 1608-52
• First superburst from a classical low-mass X-ray binary transient

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• Burst-Disk Interaction in 4U 1636-536 as observed by NICER
• Variable spreading layer in 4U 1608-52 during thermonuclear X-ray bursts in the soft state
• Insight-HXMT observations on thermonuclear X-ray bursts from 4U~1608--52 in 2022: the accretion rate dependent anisotropy of burst emission
• Return of 4U~1730--22 after 49 years silence: the peculiar burst properties of the 2021/2022 outbursts observed by Insight-HXMT
• Insight-HXMT observations on thermonuclear X-ray bursts from 4U~1608--52 in the low/hard state: the energy-dependant hard X-ray deficit and cooling saturation of the corona