Rotation and Macroturbulence in Bright Giants
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1986
- DOI:
- 10.1086/164681
- Bibcode:
- 1986ApJ...310..277G
- Keywords:
-
- Giant Stars;
- Line Spectra;
- Stellar Rotation;
- Turbulence Effects;
- Angular Velocity;
- Astronomical Catalogs;
- Hertzsprung-Russell Diagram;
- K Stars;
- Stellar Evolution;
- Stellar Temperature;
- Astrophysics;
- LINE PROFILES;
- STARS: ROTATION;
- TURBULENCE