Measurements of rotation and turbulence in F, G, and K dwarfs

Details Measurements of rotation and turbulence in F, G, and K dwarfs Measurements of rotation and turbulence in F, G, and K dwarfs

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..719g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 719-722. Research supported by the Natural Sciences

Other

89

Atmospheric Turbulence, Dwarf Stars, F Stars, G Stars, K Stars, Line Spectra, Stellar Rotation, Zeeman Effect, Angular Velocity, Doppler Effect, Fourier Transformation, Photosphere, Solar Rotation

Scientific paper

Spectral line broadening in 18 F, G, and K dwarfs is analyzed for rotation and macroturbulence. Zeeman broadening is shown to have a significant effect on the derived parameters in late G and early K dwarfs. Support is found for the traditional (lower) v sin i scale. The rotation of the sun is probably normal compared to other stars. The average macroturbulence velocity decreases rapidly with advancing spectral type at the rate of 4 km/s per thousand degrees of effective temperature. The macroturbulence velocity is proportional to the granulation velocities for F and G stars.

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