TY  - JOUR
A1  - Sugawara, Y.
A1  - Tsuboi, Y.
A1  - Maeda, Y.
A1  - Pollock, A. M. T.
A1  - Williams, P. M.
T1  - The Swift monitoring of the colliding wind binary WR 21a
T2  - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015
N2  - 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.
Y1  - 2015
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/8851
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-88517
SP  - 366
ER  -