Spectral analysis of the sdO K 648 , the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 ( NGC 7078 )

@article{Rauch2002SpectralAO,
  title={Spectral analysis of the sdO K 648 , the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 ( NGC 7078 )},
  author={T Rauch and Ulrich Heber and Klaus Werner},
  journal={Astronomy and Astrophysics},
  year={2002},
  volume={381},
  pages={1007-1014}
}
We present a spectral analysis of the sdO central star K 648 based on medium-resolution optical and high-resolution UV spectra. The photospheric parameters are determined by means of state-of-the-art NLTE model atmosphere techniques. We found and . The helium () and oxygen () abundances are about solar while carbon is enriched by a factor of 2.5 (). Nitrogen (, $\rm [N/H] = -2.0$) appears at a sub-solar value. However, these metal abundances are much higher than the cluster's metallicity (M 15… 
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