Non-LTE model atmospheres of hot central stars close to the Eddington limit - The Zanstra discrepancy and the occurrence of an emission edge at 228 A

Details Non-LTE model atmospheres of hot central stars close to the Eddington limit - The Zanstra discrepancy and the occurrence of an emission edge at 228 A Non-LTE model atmospheres of hot central stars close to the Eddington limit - The Zanstra discrepancy and the occurrence of an emission edge at 228 A

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..139h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 1, May 1984, p. 139-146. Research supported by the Science and Engine

Astronomy and Astrophysics

Astrophysics

76

Hot Stars, Stellar Atmospheres, Stellar Models, Thermodynamic Equilibrium, Ultraviolet Spectra, Absorption Spectra, Abundance, Helium, Lyman Spectra, Stellar Spectra

Scientific paper

A small grid of non-LTE plane-parallel model atmospheres close to the Eddington limit, with effective temperatures higher than 50,000K, is calculated, revealing that: (1) the He II absorption edge at 228 Å diminishes with increasing temperature and decreasing gravity, and in some models even turns into an emission edge, (2) consequently, for a given effective temperature the flux in the He II Lyman continuum of these models far exceeds the corresponding values of LTE models, and in many cases is even higher than the black body flux, thus greatly influencing the determination of effective temperatures using the Zanstra method. The occurrence of this emission edge at 228 Å is explained as a non-LTE effect. The influence of C, N, O bound-free absorptions on the model structure and emergent energy distribution is explored. The effects are found to be small at 100,000K.

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