Thermonuclear X-ray bursts in rapid succession in 4U 1636-536 with AstroSat-LAXPC

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 minutes between 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 (QPO) at ~ 5 Hz. However, we did not find any evidence of kilo-hertz QPOs and/or X-ray burst oscillations, perhaps due to the hard spectral state of the source during this observation.

arXiv commentAccepted for publication in MNRAS

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