Non-thermal velocities in stellar atmospheres. II - Six giants and the sun

Details Non-thermal velocities in stellar atmospheres. II - Six giants and the sun Non-thermal velocities in stellar atmospheres. II - Six giants and the sun

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61..155s&link_type=abstract

Astronomy and Astrophysics, vol. 61, no. 2, Oct. 1977, p. 155-159.

Physics

1

Atmospheric Turbulence, Giant Stars, Stellar Atmospheres, Sun, Atmospheric Physics, Stellar Magnitude, Velocity Distribution

Scientific paper

The photospheric small-scale velocity fields of six giants are determined and compared with each other and with the velocity fields of the sun and Arcturus. The velocities are found to decrease outwards, with a possible rise for optimal depth at 5000 A not exceeding about 0.001. The velocity fields appear to be uncorrelated with moderate metal deficiencies and variations in the atmospheric gravitational acceleration (for giants and subgiants only). A correlation between the velocity field and the Wilson-Bappu absolute magnitudes seems to be present. The sun is reconsidered and the previously derived disk-center velocity curve is compared with the velocity curve derived from the integrated solar disk.

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