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Michaël De Becker, Julian M. Pittard & Peredur M. Williams

The XMM-Newton view of the X-ray spectrum of WR140 across periastron passage

Article Open Access

Abstract

An XMM-Newton campaign dedicated to the study of the X-ray emission of the colliding wind massive binary WR140 across its 2009 periastron passage has been undertaken. The high quality EPIC spectra revealed a strong phase-locked variability both in flux and in spectral shape. The observed variations are consistently explained by the varying emission measure of the emitting plasma along the eccentric orbit, and by the changing absorption column density along the line of sight. Our results are first interpreted in the context of simple multi-temperature thermal emission models, and prospects for more sophisticated modeling are discussed.

Pour citer cet article

Michaël De Becker, Julian M. Pittard & Peredur M. Williams, «The XMM-Newton view of the X-ray spectrum of WR140 across periastron passage», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 653 - 657 URL : http://popups.ulg.ac.be/0037-9565/index.php?id=3118.

A propos de : Michaël De Becker

Department of Astrophysics, Geophysics and Oceanography, University of Liège, Belgium, and Observatoire de Haute-Provence, Saint-Michel l’Observatoire, France

A propos de : Julian M. Pittard

Department of Physics and Astronomy, University of Leeds, UK

A propos de : Peredur M. Williams

Institute for Astronomy, Royal Observatory, Edinburgh, UK