R144 revealed as a double-lined spectroscopic binary

@article{Sana2013R144RA,
  title={R144 revealed as a double-lined spectroscopic binary},
  author={Hugues Sana and T. van Boeckel and Frank Tramper and Lucas E. Ellerbroek and Alex de Koter and Lex Kaper and Anthony F. J. Moffat and Olivier Schnurr and Fabian R. N. Schneider and Douglas R. Gies},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={432}
}
R144 is a WN6h star in the 30 Doradus region. It is suspected to be a binary because of its high luminosity and its strong X-ray flux, but no periodicity could be established so far. Here, we present new X-shooter multi-epoch spectroscopy of R144 obtained at the ESO Very Large Telescope. We detect variability in position and/or shape of all the spectral lines. We measure radial velocity variations with an amplitude larger than 250 km s−1 in N iv and N v lines. Furthermore, the N iii and N v… 

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