AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917714716524544 |
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| author | Navale, Nilam R. Pawar, Devraj Rao, A. R. Misra, Ranjeev Chakraborty, Sudip Bhattacharyya, Sudip Bambole, Vaishali A. |
| author_facet | Navale, Nilam R. Pawar, Devraj Rao, A. R. Misra, Ranjeev Chakraborty, Sudip Bhattacharyya, Sudip Bambole, Vaishali A. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_05371 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690 Navale, Nilam R. Pawar, Devraj Rao, A. R. Misra, Ranjeev Chakraborty, Sudip Bhattacharyya, Sudip Bambole, Vaishali A. High Energy Astrophysical Phenomena 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. |
| title | AstroSat Observations of the Dipping Low Mass X-ray Binary XB 1254-690 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.05371 |