Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....53..341s&link_type=abstract
Astronomy and Astrophysics, vol. 53, no. 3, Dec. 1976, p. 341-345.
Astronomy and Astrophysics
Astrophysics
10
Chromosphere, Spectral Line Width, Stellar Atmospheres, Supersonic Flow, T Tauri Stars, Turbulence Effects, Emission Spectra, Energy Transfer, Late Stars, Optical Thickness, Spectral Energy Distribution, Supergiant Stars, Turbulent Diffusion, Turbulent Flow
Scientific paper
An analysis is performed to investigate qualitatively the possibility that a stellar chromosphere is dominated by the presence of supersonic turbulence. It is assumed that a chromosphere transforms only mechanical energy into radiation and is optically thin in the main energy-loss spectral region, that turbulence energy is distributed throughout the chromosphere in the form of turbulent eddies, and that the turbulence is supersonic. Momentum and energy conservation equations are combined with a boundary condition for the mechanical-energy input to obtain an expression for the turbulent velocity, the mechanical-energy flux is normalized relative to the photospheric radiative flux, and the dependence of chromospheric properties on surface gravity and effective temperature is examined. Assuming that the turbulent velocity is proportional to the line width of chromospheric Ca II K emission, it is concluded that the Wilson-Bappu effect implies temporally and spatially inhomogeneous chromospheres. The results are applied to the T Tauri star RU Lup, and observed widths of chromospheric emission lines are interpreted as being due to a supersonic turbulent velocity field.
No associations
LandOfFree
The Wilson-Bappu effect as a result of supersonic turbulence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Wilson-Bappu effect as a result of supersonic turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Wilson-Bappu effect as a result of supersonic turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1047740