A new PG 1159 star discovered in the ROSAT XRT all sky survey - NLTE analysis of X-ray and optical spectra

Details A new PG 1159 star discovered in the ROSAT XRT all sky survey - NLTE analysis of X-ray and optical spectra A new PG 1159 star discovered in the ROSAT XRT all sky survey - NLTE analysis of X-ray and optical spectra

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..561m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 561-569.

Astronomy and Astrophysics

Astronomy

54

Astronomical Spectroscopy, Rosat Mission, Sky Surveys (Astronomy), Spaceborne Astronomy, Spectrum Analysis, White Dwarf Stars, Local Thermodynamic Equilibrium, Stellar Atmospheres, Stellar Evolution, Visible Spectrum, X Ray Sources, X Ray Spectra

Scientific paper

We report in this paper on the discovery of a new PG 1159 star in the ROSAT XRT all-sky survey. The X-ray source RX J2117.1 + 3412 is relatively faint and was selected for optical identification on the basis of its extreme X-ray softness. With V roughly 13.2, the counterpart of the X-ray source is in the optical the second brightest member of this class. CCD forbidden O III imagery reveals that the star is surrounded by an old highly excited planetary nebula of faint surface brightness. Optical line strengths of He II, C IV, and O VI and the overall optical and ROSAT PSPC (0.1-2.4 keV) energy distributions are compared to predictions of NLTE model atmospheres. We find an excellent agreement between the atmospheric parameters derived from optical and soft X-ray data. The effective temperature is close to 150,000 K. Abundances of He, C and O are found to be consistent with those derived in other PG 1159 stars using the same NLTE analysis whereas the surface gravity is significantly smaller in RX J2117.1 + 3412.

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