TY  - JOUR
A1  - Richardson, Noel D.
A1  - Shenar, Tomer
A1  - Roy-Loubier, Olivier
A1  - Schaefer, Gail
A1  - Moffat, Anthony F. J.
A1  - St-Louis, Nicole
A1  - Gies, Douglas R.
A1  - Farrington, Chris
A1  - Hill, Grant M.
A1  - Williams, Peredur M.
A1  - Gordon, Kathryn
A1  - Pablo, Herbert
A1  - Ramiaramanantsoa, Tahina
T1  - The CHARA Array resolves the long-period Wolf-Rayet binaries WR 137 and WR 138
JF  - Monthly notices of the Royal Astronomical Society
N2  - We report on interferometric observations with the CHARAArray of two classical Wolf-Rayet (WR) stars in suspected binary systems, namely WR 137 and WR 138. In both cases, we resolve the component stars to be separated by a few milliarcseconds. The data were collected in the H band, and provide a measure of the fractional flux for both stars in each system. We find that the WR star is the dominant H-band light source in both systems (fWR, 137 = 0.59 +/- 0.04; fWR, 138 = 0.67 +/- 0.01), which is confirmed through both comparisons with estimated fundamental parameters for WR stars and O dwarfs, as well as through spectral modelling of each system. Our spectral modelling also provides fundamental parameters for the stars and winds in these systems. The results on WR 138 provide evidence that it is a binary system which may have gone through a previous mass-transfer episode to create the WR star. The separation and position of the stars in the WR 137 system together with previous results from the IOTA interferometer provides evidence that the binary is seen nearly edgeon. The possible edge-on orbit of WR 137 aligns well with the dust production site imaged by the Hubble Space Telescope during a previous periastron passage, showing that the dust production may be concentrated in the orbital plane.
KW  - binaries: visual
KW  - stars: individual: WR 137
KW  - stars: individual: WR 138
KW  - stars: mass-loss
KW  - stars: winds, outflows
KW  - stars: Wolf-Rayet
Y1  - 2016
U6  - https://doi.org/10.1093/mnras/stw1585
SN  - 0035-8711
SN  - 1365-2966
VL  - 461
SP  - 4115
EP  - 4124
PB  - Oxford Univ. Press
CY  - Oxford
ER  -