A New PG 1159-Type Central Star Discovered in the ROSAT XRT All Sky Survey: Non-LTE Analysis of X-ray and Optical Spectra

  • K. Werner
  • C. Motch
  • M. Pakull
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 155)

Abstract

We report on the discovery of a new PG 1159 star in the ROSAT XRT all sky survey and give results of a model atmosphere analysis. The X-ray source RX J2117.1+3412 is relatively faint (0.33 cnts-1) and extremely soft. Ground based optical follow-up spectroscopy (OHP, France) proofs its PG 1159 nature: It belongs to the “low gravity emission” spectral subtype. Optically, it is the second brightest PG 1159 star. CCD [O III] imagery reveals that the star is surrounded by an old arc-shaped planetary nebula of faint surface brightness. The spectral analysis of the central star was performed with non-LTE line blanketed model atmospheres (Werner 1992). We find a complete agreement between the atmospheric parameters determined at optical wavelengths and in the ROSAT PSPC energy range.

Keywords

Optical Spectrum Complete Agreement Model Atmosphere Atmospheric Parameter Central Star 
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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • K. Werner
    • 1
  • C. Motch
    • 2
  • M. Pakull
    • 3
  1. 1.Institut für Theoretische Physik und SternwarteKielGermany
  2. 2.Max-Planck-Institut für Extraterrestrische PhysikGarchingGermany
  3. 3.Landessternwarte HeidelbergGermany

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