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Title: Thermonuclear X-ray bursts in rapid succession in 4U 1636-536 with AstroSat-LAXPC
Authors: Beri, Aru
Paul, Biswajit
+ 12 Co-authors
Keywords: accretion
accretion discs
stars: neutron
X-rays: binaries
X-rays: bursts
X-rays: individual: 4U 1636—53
Issue Date: 1-Feb-2019
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2019, Vol. 482, p4397–4407
Abstract: We present results from an observation of the low-mass X-ray binary 4U 1636-536 obtained with the LAXPC instrument aboard AstroSat. The observations of 4U 1636-536 made during the performance verification phase of AstroSat showed seven thermonuclear X-ray bursts in a total exposure of ˜65 ks over a period of about two consecutive days. Moreover, the light curve of 4U 1636-536 revealed the presence of a rare triplet of X-ray bursts, having a wait time of about 5.5 min between the second and the third bursts. We also present results from time-resolved spectroscopy performed during these seven X-ray bursts. In addition, we have also detected a transient quasi-periodic oscillation at ˜5 Hz. However, we did not find any evidence of kilo-hertz quasi-periodic oscillations and/or X-ray burst oscillations, perhaps due to the hard spectral state of the source during this observation.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2019 The Author(s)
Appears in Collections:Research Papers (A&A)

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