The Swift monitoring of the colliding wind binary WR 21a

The X-ray observations of the colliding wind binary WR 21a is reported. The first monitoring performed by Swift/XRT in order to reveal the phase-locked variation. Our observations cover 201 different epochs from 2013 October 1 to 2015 January 30 for a total exposure of about 306 ks. It is found for the first time that the luminosity varies roughly in inverse proportion to the separation of the two stars before the X-ray maximum but later drops rapidly toward periastron.

Metadaten
Author details:	Y. Sugawara, Y. Tsuboi, Y. Maeda, A. M. T. Pollock, P. M. Williams
URN:	urn:nbn:de:kobv:517-opus4-88517
Title of parent work (English):	Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
Publication type:	Article
Language:	English
Publication year:	2015
Publishing institution:	Universität Potsdam
Release date:	2016/02/23
First page:	366
Organizational units:	Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
DDC classification:	5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Publishing method:	Universitätsverlag Potsdam
Collection(s):	Universität Potsdam / Tagungsbände/Proceedings (nicht fortlaufend) / Wolf-Rayet Stars: Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 / Wolf-Rainer Hamann, Andreas Sander, Helge Todt (Eds.)
	Universität Potsdam / Tagungsbände/Proceedings (nicht fortlaufend) / Wolf-Rayet Stars: Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 / Wolf-Rainer Hamann, Andreas Sander, Helge Todt (Eds.) / Posters
License (German):	Keine öffentliche Lizenz: Unter Urheberrechtsschutz