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Bharti Arora & Jeewan Chandra Pandey

X-ray observations of the colliding wind binary WR 25

(Volume 87 - Année 2018 — Actes de colloques — First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India)
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Mots-clés : astronomie, astrophysique, étoiles massives, rayons X, variabilité

Abstract

Using the archival data obtained from Chandra and Suzaku spanning over '8 years, we present an analysis of a WN6h+O4f Wolf-Rayet binary, WR 25. The X-ray light curves folded over a period of '208 d in the 0.3 - 10.0 keV energy band showed phase-locked variability where the count rates were found to be maximum near the periastron passage. The X-ray spectra of WR 25 were well explained by a two-temperature plasma model with temperatures of 0.64 ± 0.01 and 2.96 ± 0.05 keV and are consistent with previous results. The orbital phase dependent local hydrogen column density was found to be maximum just after the periastron passage, when the WN type star is in front of the O star. The hard (2.0 - 10.0 keV) X-ray luminosity was linearly dependent on the inverse of binary separation which confirms that WR 25 is a colliding wind binary.

Keywords : astronomy, astrophysics, massive stars, variability, X-rays

To cite this article

Bharti Arora & Jeewan Chandra Pandey, «X-ray observations of the colliding wind binary WR 25», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 193 - 197 URL : https://popups.uliege.be/0037-9565/index.php?id=7642.

About: Bharti Arora

Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India, bharti@aries.res.in

About: Jeewan Chandra Pandey

Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital 263002, India