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High-resolution spectroscopy of central stars of planetary nebulae - LSS 1362High 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.
Document ID
19880050524
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Heber, U.
(Kiel Univ. Germany)
Werner, K.
(Kiel, Universitaet Institut fuer theoretische Physik und Sternwarte, Federal Republic of Germany, United States)
Drilling, J. S.
(Louisiana State University Baton Rouge, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Astronomy and Astrophysics
Volume: 194
Issue: 1-2
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
88A37751
Funding Number(s)
CONTRACT_GRANT: NAG5-71
CONTRACT_GRANT: NSF AST-85-14574
CONTRACT_GRANT: DFG-HU-39/23-1
Distribution Limits
Public
Copyright
Other

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