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- W2035689629 abstract "view Abstract Citations (40) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Velocity fields in the shell of alpha Orionis. Boesgaard, A. M. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1979 DOI: 10.1086/157307 Bibcode: 1979ApJ...232..485B Keywords: 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; Astrophysics; Circumstellar Shells:Late-Type Supergiants; Circumstellar Shells:Velocities; Emission Lines:Late-Type Supergiants; Late-Type Supergiants:Line Profiles full text sources ADS | data products SIMBAD (1)" @default.
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- W2035689629 date "1979-09-01" @default.
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- W2035689629 title "Velocity fields in the shell of alpha Orionis" @default.
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