| Name: | Ketan Rikame |
| Affiliation: | Raman Research Institute (RRI), Bangalore ; CHRIST (Deemed to be University) |
| Conference ID : | ASI2024_671 |
| Title : | X-ray Diwali in sky: Study of flares and bursts during eclipses of X-ray binary systems |
| Authors : | Ketan Rikame, Biswajit Paul, Rahul Sharma, V. Jithesh |
| Authors Affiliation: | 1. Ketan Rikame, V. Jithesh (CHRIST (Deemed to be University))
2. Ketan Rikame, Biswajit Paul, Rahul Sharma (Raman Research Institute) |
| Mode of Presentation: | Poster |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | Reprocessed emission in X-ray binaries holds clues about the environment of the compact object and its chemical composition, ionization levels, etc. In eclipsing X-ray binary systems, the direct X-ray emission is blocked by the companion star during the eclipse, and only reprocessed emission is observed. This makes them ideal systems for studying reprocessed emission. Flares are observed in high-mass X-ray binaries (HMXBs) due to increase in the rate of matter accretion onto the compact object. In neutron star (NS) low-mass X-binaries (LMXBs), X-ray bursts are observed due to unstable thermonuclear burning of accreted fuel on the surface of neutron stars. Some X-ray binaries show flaring or bursts even during the eclipse. The study of such eclipse flares and eclipse bursts gives additional clues regarding the size of the reprocessing region and helps distinguish between different components of the X-ray spectrum observed during the eclipse. We have searched for flares during the eclipses of HMXBs in a large volume of archival X-ray data and detected eclipse flares in several HMXB sources (Vela X-1, LMC X-4 and 4U 1700-37). Similarly, we also found bursts during eclipses of a few LMXB sources (EXO 0748 676, XTE J1710−281). In this study, we compare the spectral properties of eclipse flares with the eclipse persistent emission data in HMXBs. We do the timing study of the eclipse bursts observed in LMXBs. Our analysis provides insights into the size and composition of the reprocessing regions in these sources and also into the physical origin of the components in the X-ray spectrum of these sources. |
