Statistics – Computation
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..664s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 664-682. SNSF-supported research.
Statistics
Computation
49
Nonequilibrium Thermodynamics, O Stars, Spectrum Analysis, Stellar Atmospheres, Stellar Spectra, Wolf-Rayet Stars, Helium, Hydrogen, Magellanic Clouds, Nitrogen, Radiative Transfer, Stellar Winds
Scientific paper
The paper presents the results of a spectral analysis of the Ofpe/WN9 star HD 269227 (R84), which assumes a spherically expanding atmosphere to find solutions for equations of radiative transfer. The spectra of hydrogen and helium were predicted with a non-LTE model. Six stellar parameters were determined for R84. The shape of the velocity law is empirically found, since it can be probed from the terminal velocity of the wind. The six stellar parameters are further employed in a hydrodynamic model where stellar wind is assumed to be directed by radiation pressure, duplicating the mass-loss rate and the terminal wind velocity. The velocity laws found by computation and analysis are found to agree, supporting the theory of radiation-driven stellar wind. R84 is surmised to be a post-red supergiant which lost half of its initial mass, possibly during the red-supergiant phase. This mass loss is also suggested by its spectroscopic similarity to S Doradus.
Hamann Wolf-Rainer
Hubeny Ivan
Leitherer Claus
Schmutz Werner
Vogel Manfred
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