Other
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1021o&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1021-1030. Research supported by the University of Texas
Other
33
Balmer Series, Early Stars, H Alpha Line, Stellar Spectra, Stellar Winds, B Stars, H Beta Line, O Stars, Radiative Transfer
Scientific paper
Theoretical H-alpha profiles assuming spherically symmetric mass loss, and using the Sobolev approximation in the radiative transfer, are computed to match the observed profiles in 10 stars ranging in spectral type from O4f to B3 Ia. Although the assumptions make impossible an exact fit at the region near line center, where stellar rotation causes deviations from spherical symmetry and low velocities cause a larger error in the radiative transfer, it is shown that the good high-velocity wing fit obtained makes possible an estimate of the mass-loss rate and the determination of how the flow velocity increases with distance from the star. Variability in the observed profiles is discussed, and a comparison of the derived mass-loss rates with other determinations is presented.
Ebbets Dennis
Olson Gordon L.
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