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X-ray view of colliding winds in WR 25

Published online by Cambridge University Press:  16 August 2023

Bharti Arora Open the ORCID record for Bharti Arora [Opens in a new window] ,
Jeewan C. Pandey  and
Michaël De Becker
Bharti Arora
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital-263 002, Uttarakhand, India
Jeewan C. Pandey
Affiliation:
Aryabhatta Research Institute of Observational Sciences, Nainital-263 002, Uttarakhand, India
Michaël De Becker
Affiliation:
Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège, Quartier Agora, 19c, Allée du 6 Aôut, B5c, B-4000 Sart Tilman, Belgium
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Astract

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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.

Keywords

Stars:early-typebinaries:colliding-windsX-rays:starsstars:individual: WR 25
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 230 - 231
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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