The CHARA Array resolves the long-periodWolf-Rayet binaries WR 137 andWR 138

Noel D. Richardson, Tomer Shenar, Olivier Roy-Loubier, Gail Schaefer, Anthony F.J. Moffat, Nicole St-Louis, Douglas R. Gies, Chris Farrington, Grant M. Hill, Peredur M. Williams, Kathryn Gordon, Herbert Pablo, Tahina Ramiaramanantsoa

Research output: Contribution to journalArticlepeer-review

Abstract

We report on interferometric observations with the CHARAArray of two classicalWolf-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.

Original languageEnglish
Pages (from-to)4115-4124
Number of pages10
JournalMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume461
Issue number4
DOIs
StatePublished - 1 Oct 2016
Externally publishedYes

Keywords

  • Binaries: visual
  • Stars: individual: WR 137
  • Stars: individual: WR 138
  • Stars: mass-loss
  • Stars: winds, outflows
  • stars: Wolf-Rayet

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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