High-resolution spectroscopy of central stars of planetary nebulae - LSS 1362

Details High-resolution spectroscopy of central stars of planetary nebulae - LSS 1362 High-resolution spectroscopy of central stars of planetary nebulae - LSS 1362

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..223h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 223-229.

Astronomy and Astrophysics

Astrophysics

21

Hot Stars, Planetary Nebulae, Stellar Atmospheres, Stellar Spectra, Absorption Spectra, Helium, Hydrogen, Radial Velocity, Ubv Spectra

Scientific paper

High resolution spectra of the hot sdO star LSS 1362, a central star of a planetary nebula, are analyzed by means of model atmosphere techniques. Improved NLTE model atmospheres based on the newly developed 'accelerated lambda iteration' method are used. The very high effective temperature (100000 K) derived previously from the UV energy distribution is confirmed. The surface gravity (log g = 5.3) and a normal helium abundance are derived. A mass of 0.65 solar mass and a luminosity of 10 exp 3.9 solar luminosities result from a comparison with evolutionary tracks. The distance is 1.1 kpc and the nebula has a diameter of about 0.25 pc to 0.5 pc. Weak photospheric emission lines of He II, CIV, Nv, and O v are detected. These lines are slightly blue-shifted with respect to the absorption line spectrum which is regarded as evidence for an atmospheric velocity field. It is conjectured that the observed broadening of the metal lines (25 km/s) may be caused by the velocity field rather than by rotation.

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