학술논문
The orbit and stellar masses of the archetype colliding-wind binary WR 140
Document Type
Report
Author
Joshua D. Thomas; Noel D. Richardson; J. J. Eldridge; Gail H. Schaefer; John D. Monnier; Hugues Sana; Anthony F. J. Moffat; Peredur Williams; Michael F Corcoran; Ian R. Stevens; Gerd Weigelt; Farrah D. Zainol; Narsireddy Anugu; Jean-Baptiste Le Bouquin; Theo ten Brummelaar; Fran Campos; Andrew Couperus; Claire L. Davies; Jacob Ennis; Thomas Eversberg; Oliver Garde; Tyler Gardner; Joan Guarro Flo; Stefan Kraus; Aaron Labdon; Cyprien Lanthermann; Robin Leadbeater; T. Lester; Courtney Maki; Brendan McBride; Dogus Ozuyar; J. Ribeiro; Benjamin Setterholm; Berthold Stober; Mackenna Wood; Uwe Zurmuhl
Source
Monthly Notices of the Royal Astronomical Society. 504(4)
Subject
Language
English
ISSN
1365-2966
0035-8711
0035-8711
Abstract
We present updated orbital elements for the Wolf–Rayet (WR) binary WR 140 (HD 193793; WC7pd + O5.5fc). The new orbital elements were derived using previously published measurements along with 160 new radial velocity measurements across the 2016 periastron passage of WR 140. Additionally, four new measurements of the orbital astrometry were collected with the CHARA Array. With these measurements, we derive stellar masses of M(WR)=10.31±0.45Mꙩ and M(O)=29.27±1.14Mꙩ. We also include a discussion of the evolutionary history of this system from the Binary Population and Spectral Synthesis model grid to show that this WR star likely formed primarily through mass-loss in the stellar winds, with only a moderate amount of mass lost or transferred through binary interactions.