Rotation and macroturbulence in bright giants

Details Rotation and macroturbulence in bright giants Rotation and macroturbulence in bright giants

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...310..277g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 310, Nov. 1, 1986, p. 277-283. NSERC-supported research.

Astronomy and Astrophysics

Astrophysics

36

Giant Stars, Line Spectra, Stellar Rotation, Turbulence Effects, Angular Velocity, Astronomical Catalogs, Hertzsprung-Russell Diagram, K Stars, Stellar Evolution, Stellar Temperature

Scientific paper

Spectral line profiles of 35 F, G, and K bright giants were analyzed to obtain rotation rates, v sin i, and macroturbulence dispersion. This sample indicates that rotation rates of cool class II giants is less than 11 km/s, in contrast with some recent periodicity measurements. Macroturbulence dispersion generally increases with effective temperature, but the range of values at a given effective temperature is much larger than seen for lower luminosity classes; this is interpreted in terms of red-giant and blue-loop evolution. No evidence is found for angular momentum dissipation on the first crossing of the H-R diagram.

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