Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..485b&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 1, 1979, p. 485-495.
Astronomy and Astrophysics
Astrophysics
33
Chromosphere, Late Stars, Mass Transfer, Stellar Envelopes, Supergiant Stars, Density Distribution, Graphs (Charts), Iron, Line Spectra, Radial Velocity, Red Shift, Schwarzschild Metric, Stellar Mass, Velocity Distribution
Scientific paper
The paper examines the Schwarzschild (1975) hypothesis that the dominant convective cells control the integrated brightness variations and the mass-loss mechanism provided by the velocities and line profiles of the Fe II emission lines in alpha Ori. Eight new spectrograms of the Fe II emission lines in alpha Ori and the emission at Ca II H and K were redshifted. The shell was modeled as a spherical moving envelope, and calculated line profiles were compared with observed. The effects of model size, density distribution, velocities, and optical depth on the calculated profiles are discussed. The parameters which match the strong, self-reversed Fe II line at 3228 angstroms, the shell, and material acceleration and turbulence within the shell are considered, and it is suggested that the material and velocities in the inner shell region may arise from the motions of the large convective cells hypothesized by Schwarzschild in the photospheres of red giants. The mechanical energy provided by the motions in the stellar atmosphere and the supersonic infall can provide the thermal and turbulent energy in the interface between the photosphere and the circumstellar shell.
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