| Name: | M. VARUN |
| Affiliation: | CHRIST (Deemed to be University) |
| Conference ID : | ASI2024_382 |
| Title : | Type I X-ray burst studies of 4U 1702−429 using AstroSat |
| Authors : | M. Varun, Neal Titus Thomas, S. B. Gudennavar, S. G. Bubbly
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| Authors Affiliation: | M. Varun, Neal Titus Thomas, S. B. Gudennavar, S. G. Bubbly (Department of Physics and Electronics CHRIST (Deemed to be University), Bangalore Central Campus, Bengaluru-560029)
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| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | 4U 1702−429, discovered in 1976, is an atoll type neutron star low mass X-ray binary that is known to exhibit type I X-ray bursts. It was observed twice on 2018 April 27 and 2019 August 8 by AstroSat/Soft X-ray Telescope and Large Area X-ray Proportional Counters, during which it exhibited three type I X-ray bursts. We have performed spectral analysis of the persistent and burst emission from the source during these observations. Spectral analysis of the persistent emission, showed that the 0.7 - 16.0 keV spectra could be adequately fit with the model combination consisting of an absorbed multi-temperature blackbody component convolved with a thermal Comptonization component and a power-law component. Spectral parameters thus obtained pointed the source to be in the hard spectral state. Time resolved spectral analysis of burst emission showed that the source underwent photospheric radius expansion (PRE) during two of the bursts. Using the most prominent of these PRE bursts, the radius of the neutron star in the system was inferred to be 10.60 +0.75/−0.72 km; and source distance was calculated to be 6.95 ± 0.11 and 7.67 +0.13/−0.12 kpc, assuming isotropic and anisotropic burst emissions, respectively.
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