AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690 - IRFU-AIM
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2024

AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690

Nilam R Navale
  • Fonction : Auteur
Devraj Pawar
  • Fonction : Auteur
A.R Rao
  • Fonction : Auteur
Ranjeev Misra
  • Fonction : Auteur
Sudip Bhattacharyya
  • Fonction : Auteur
Vaishali A Bambole
  • Fonction : Auteur

Résumé

XB 1254-690 is a neutron star low-mass X-ray binary with an orbital period of 3.88 hrs, and it exhibits energy-dependent intensity dips, thermonuclear bursts, and flares. We present the results of an analysis of a long observation of this source using the AstroSat satellite. The X-ray light curve gradually changed from a high-intensity flaring state to a low-intensity one with a few dips. The hardness intensity diagram showed that the source is in a high-intensity banana state with a gradually changing flux. Based on this, we divide the observation into four flux levels for a flux-resolved spectral study. The X-ray spectra can be explained by a model consisting of absorption, thermal emission from the disc and non-thermal emission from the corona. From our studies, we detect a correlation between the temperature of the thermal component and the flux and we examine the implications of our results for the accretion disc geometry of this source.
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hal-04660185 , version 1 (30-08-2024)

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Nilam R Navale, Devraj Pawar, A.R Rao, Ranjeev Misra, Sudip Chakraborty, et al.. AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690. Monthly Notices of the Royal Astronomical Society, 2024, 532 (3), pp.2955-2964. ⟨10.1093/mnras/stae1668⟩. ⟨hal-04660185⟩
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