AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690
Abstract
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.
Keywords
Cite
@article{arxiv.2407.05371,
title = {AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690},
author = {Nilam R. Navale and Devraj Pawar and A. R. Rao and Ranjeev Misra and Sudip Chakraborty and Sudip Bhattacharyya and Vaishali A. Bambole},
journal= {arXiv preprint arXiv:2407.05371},
year = {2024}
}
Comments
Accepted for publication in MNRAS; 11 pages, 12 figures