Non-LTE model atmospheres for central stars of planetary nebulae

Details Non-LTE model atmospheres for central stars of planetary nebulae Non-LTE model atmospheres for central stars of planetary nebulae

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.228..759c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 228, Oct. 1, 1987, p. 759-778. SERC-supported research.

Astronomy and Astrophysics

Astronomy

114

Atmospheric Models, Nonequilibrium Conditions, Planetary Nebulae, Stellar Atmospheres, Atmospheric Temperature, Continuous Radiation, Helium, Hydrogen, Tables (Data)

Scientific paper

A grid of hot non-LTE model atmospheres with H and He opacity sources has been calculated. The emergent fluxes, together with integrals required for Zanstra and Energy-Balance methods, are presented. These are needed for the analyses and modelling of planetary nebulae. The grid spans the following ranges: Teff: 40 - 180×103K, log g: 4.0 - 8.0, He/H: 10 and 1 per cent by number. The low helium abundance models are included to study the effects of gravitational settling in some central stars. The grid of models has been chosen so that the models cover adequately, in the temperature-gravity plane, Schönberner's evolutionary tracks for central stars. Some results on the non-LTE populations of He+ levels and the formation of the He II continuum are described.

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