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Ups and downs in the X-ray emission of the colliding wind binaries HD 168112 and HD 167971 by Rauw, Gregor; Blomme, Ronny; Naze, Yael; Volpi, Delia; Fernandez-Vera, Sorenza is a scholarly article available to read on EtoBox.

What is Ups and downs in the X-ray emission of the colliding wind binaries HD 168112 and HD 167971 about?

The long-period O-star binary system HD 168112 and the triple O-star system HD 167971 are well-known sources of non-thermal radio emission that arises from a colliding wind interaction. The wind-wind collisions in these systems should result in phase-dependent X-ray emissions. The presence of a population of relativistic electrons in the wind interaction zone could affect the properties of the X-ray emission and make it deviate from the behaviour expected for adiabatic shocks. We investigate the X-ray emission of these systems with the goals of quantifying the fraction of the X-ray flux arising from wind interactions and determining whether these emissions follow the predictions for adiabatic wind-wind collisions. Six X-ray observations were collected with XMM-Newton. Three observations were scheduled around the most recent periastron passage of HD 168112. Spectra and light curves were analysed and compared with simple predictions of model calculations for X-ray emission from colliding wind systems. The X-ray emission of HD 168112 varies as the inverse of the orbital separation, as expected for an adiabatic wind interaction zone. The relative contribution of intrinsic X-ray emissio

Author

Rauw, Gregor; Blomme, Ronny; Naze, Yael; Volpi, Delia; Fernandez-Vera, Sorenza

Published

2024

Language

EN