Other
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..173g&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 173-194.
Other
92
B Stars, Early Stars, O Stars, Oao 3, Stellar Mass Ejection, Ultraviolet Spectra, Ionization, Photosphere, Resonance Lines, Stellar Evolution, Stellar Luminosity, Stellar Spectra, Stellar Winds
Scientific paper
Ultraviolet line profiles are fitted with theoretical line profiles in the cases of 25 stars covering a spectral type range from O4 to B1, including all luminosity classes. Ion column densities are compared for the determination of wind ionization, and it is found that the O VI/N V ratio is dependent on the mean density of the wind and not on effective temperature value, while the Si IV/N V ratio is temperature-dependent. The column densities are used to derive a mass-loss rate parameter that is empirically correlated against the mass-loss rate by means of standard stars with well-determined rates from IR or radio data. The empirical mass-loss rates obtained are compared with those derived by others and found to vary by as much as a factor of 10, which is shown to be due to uncertainties or errors in the ionization fractions of models used for wind ionization balance prediction.
Gathier R.
Lamers Henny J. G. L. M.
Snow Theodore P.
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