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2021MNRAS.504.5221T - Mon. Not. R. Astron. Soc., 504, 5221-5230 (2021/July-2)

The orbit and stellar masses of the archetype colliding-wind binary WR 140.

THOMAS J.D., RICHARDSON N.D., ELDRIDGE J.J., SCHAEFER G.H., MONNIER J.D., SANA H., MOFFAT A.F.J., WILLIAMS P., CORCORAN M.F., STEVENS I.R., WEIGELT G., ZAINOL F.D., ANUGU N., LE BOUQUIN J.-B., TEN BRUMMELAAR T., CAMPOS F., COUPERUS A., DAVIES C.L., ENNIS J., EVERSBERG T., GARDE O., GARDNER T., GUARRO FLO J., KRAUS S., LABDON A., LANTHERMANN C., LEADBEATER R., LESTER T., MAKI C., McBRIDE B., OZUYAR D., RIBEIRO J., SETTERHOLM B., STOBER B., WOOD M. and ZURMUHL U.

Abstract (from CDS):

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±0.45 M_☉and M_ O_ = 29.27±1.14 M☉. 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.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): binaries: general - stars: fundamental parameters - stars: Wolf-Rayet - stars: winds - outflows - stars: individual: WR 140

Simbad objects: 17

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