Abstract Details
| Name: | Nazma Islam |
| Affiliation: | NASA GSFC and UMBC |
| Conference ID : | ASI2024_573 |
| Title : | Superorbital modulations in supergiant High Mass X-ray binaries |
| Authors : | Nazma Islam |
| Authors Affiliation: | Center for Space Science and Technology, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA |
| Mode of Presentation: | Oral |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | A puzzling variety of superorbital modulations have been discovered in several supergiant High-Mass X-ray binaries . To investigate the mechanisms driving these superorbital modulations, we have analyzed Swift/BAT lightcurves of these sources and constructed their dynamic power spectra and superorbital intensity profiles. These Swift BAT observations are complemented by pointed Swift XRT, NICER and NuSTAR observations performed at the maximum and minimum phase of a single superorbital cycle for each of these sources. The results from this analysis indicate the possible presence of structures in the stellar winds of the supergiant stars in the form of multiple co-rotating interaction regions (CIRs) or from tidal oscillations. |