Computed He II spectra for Wolf-Rayet stars - A grid of models

Details Computed He II spectra for Wolf-Rayet stars - A grid of models Computed He II spectra for Wolf-Rayet stars - A grid of models

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..173h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 173-182.

Astronomy and Astrophysics

Astrophysics

80

Helium, Radiative Transfer, Stellar Models, Stellar Spectra, Wolf-Rayet Stars, Atmospheric Models, Nonequilibrium Thermodynamics, Radii, Stellar Mass Ejection, Stellar Temperature

Scientific paper

A grid of synthetic He II spectra for Wolf-Rayet stars is presented, covering a large range in radius and temperature. The non-LTE radiation transfer in spherically expanding atmospheres is treated in the comoving frame, and the solution is obtained by "iteration with approximate lambda operators". Results are given for the continuum flux distribution and for the profiles of the most prominent lines (He II 1640 Å and 4686 Å). The lines show the strongest emission at stellar temperatures of about 35kK, but also depend sensitively on the stellar radius.

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