@article{HuenemoerderGayleyHamannetal.2015,
  author    = {Huenemoerder, David P. and Gayley, K. G. and Hamann, Wolf-Rainer and Ignace, R. and Nichols, J. S. and Oskinova, Lida and Pollock, A. M. T. and Schulz, Norbert S. and Shenar, Tomer},
  title     = {Probing Wolf-Rayet winds: Chandra/HETG X-ray spectra of WR 6},
  series = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  volume    = {815},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics},
  number    = {1},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {0004-637X},
  doi       = {10.1088/0004-637X/815/1/29},
  pages     = {16},
  year      = {2015},
  abstract  = {With a deep Chandra/HETGS exposure of WR 6, we have resolved emission lines whose profiles show that the X-rays originate from a uniformly expanding spherical wind of high X-ray-continuum optical depth. The presence of strong helium-like forbidden lines places the source of X-ray emission at tens to hundreds of stellar radii from the photosphere. Variability was present in X-rays and simultaneous optical photometry, but neither were correlated with the known period of the system or with each other. An enhanced abundance of sodium revealed nuclear-processed material, a quantity related to the evolutionary state of the star. The characterization of the extent and nature of the hot plasma in WR 6 will help to pave the way to a more fundamental theoretical understanding of the winds and evolution of massive stars.},
  language  = {en}
}