@article{HamannGraefenerKoesterke2003,
  author    = {Hamann, Wolf-Rainer and Gr{\"a}fener, G{\"o}tz and Koesterke, Lars},
  title     = {WR Central Stars},
  isbn      = {1-583-81148-6},
  year      = {2003},
  abstract  = {Wolf-Rayet type central stars have been analyzed with adequate model atmospheres. The obtained stellar parameters and chemical abundances allow for a discussion of their evolutionary origin.},
  language  = {en}
}
@article{HamannGraefenerKoesterke2003,
  author    = {Hamann, Wolf-Rainer and Gr{\"a}fener, G{\"o}tz and Koesterke, Lars},
  title     = {Wolf-Rayet star parameters from spectral analyses},
  isbn      = {1-58381-133-8},
  year      = {2003},
  abstract  = {The Potsdam Non-LTE code for expanding atmospheres, which accounts for clumping and iron-line blanketing, has been used to establish a grid of model atmospheres for WC stars. A parameter degeneracy is discovered for early-type WC models which do not depend on the "stellar temperature". 15 galactic WC4-7 stars are analyzed, showing a very uniform carbon abundance (He:C=55:40) with only few exceptions.},
  language  = {en}
}
@article{GraefenerKoesterkeHamann2003,
  author    = {Gr{\"a}fener, G{\"o}tz and Koesterke, Lars and Hamann, Wolf-Rainer},
  title     = {The WR population in CTS 1026},
  isbn      = {1-58381-133-8},
  year      = {2003},
  abstract  = {The blue compact H II galaxy CTS 1026 shows very strong WR emission features around 4686 AA and 5800 AA. We present high S/N optical spectra of the nucleus of this object. Byanalysis of the WR profile shapes, we determine the dominant spectral types and the WN/WC ratio in the starforming region. The ratio WR/O is determined via standard nebular diagnostics.},
  language  = {en}
}