@inproceedings{RaassenHuchtMilleretal.2007,
  author    = {Raassen, A. J. J. and Hucht, K. A. van der and Miller, N. A. and Cassinelli, Joseph P.},
  title     = {XMM-Newton observations of zeta Orionis (O9.7 Ib) : a collisional ionization equilibrium model},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-17747},
  year      = {2007},
  abstract  = {We present the analysis of XMM-Newton observations of ζ Orionis. The analysis is based on fitting to the total spectrum as well as diagnostics of individual line.},
  language  = {en}
}
@article{WilliamsvanderHucht2015,
  author    = {Williams, P. M. and van der Hucht, K. A.},
  title     = {The colliding-wind WC9+OB system WR 65 and dust formation by WR stars},
  series = {Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.-5. June 2015},
  journal   = {Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.-5. June 2015},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-88188},
  pages     = {275 -- 278},
  year      = {2015},
  abstract  = {Observations of the WC9+OB system WR65 in the infrared show variations of its dust emission consistent with a period near 4.8 yr, suggesting formation in a colliding-wind binary (CWB) having an elliptical orbit. If we adopt the IR maximum as zero phase, the times of X-ray maximum count and minimum extinction to the hard component measured by Oskinova \& Hamann fall at phases 0.4-0.5, when the separation of the WC9 and OB stars is greatest. We consider WR65 in the context of other WC8-9+OB stars showing dust emission.},
  language  = {en}
}