binaries:colliding-winds; Stars:early-type; stars:individual: WR 25; X-rays:stars; Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] The long-term behavior of a colliding wind binary WR 25 is presented using archival X-ray data obtained over a time span of: 16 years. The present analysis reveals phase-locked variations repeating consistently over many consecutive orbits of the source (with binary orbital period: 208 days). A significant deviation of the X-ray flux with respect to the theoretical 1/D trend (D is the binary separation) close to periastron passage has been observed. This may occur due to the shifting of the adiabatic wind collision to the radiative regime in that part of the orbit. Further, no signature of X-ray emission in 10.0-79.0 keV energy range attributable to inverse Compton scattering is detected by NuSTAR.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège [BE]
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Arora, Bharti ; Aryabhatta Research Institute of Observational Sciences
Pandey, Jeewan C.; Aryabhatta Research Institute of Observational Sciences, Nainital, India
De Becker, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Sciences spatiales
Language :
English
Title :
X-ray view of colliding winds in WR 25
Publication date :
2023
Event name :
IAU Symposium : Winds of Stars and Exoplanets
Event place :
South Korea
Event date :
8-11 August 2022
Event number :
370
Audience :
International
Journal title :
Proceedings of the International Astronomical Union
